Mariah Carey and Nick Cannon put their multi-wing Bel-Air mansion on the market for just under $13 million last Friday, according to celebrity real estate blog The Real Estalker.

The celeb couple purchased the property back in spring of 2009 for $6.975 million.

The home is listed through The Agency for $12.995 million, according to Zillow.

The quasi-colonial style mansion is 11,750 square feet with seven bedrooms and nine bathrooms, and includes amenities such as an indoor basketball court, putting green, gym, pool, and personal movie theater. 

Welcome to Mariah Carey and Nick Cannon's Bel-Air mansion.

Source: Rodeo Realty

The home has 11,750 square feet of space and a grand, formal entry.

Source: Rodeo Realty

Every room has tall ceilings and huge windows that look out on the property.

Source: Rodeo Realty

A real estate mogul is having a tough time unloading his insanely ornate, 47,000-square-foot mansion in Bradbury, Calif.

According to Curbed, the owner, Don G. Abbey of the Abbey Company, chopped the price on the home from $78.8 million to $68.8 million when it failed to sell after a year on the market.

The house is a newly built Mediterranean-style mansion that took eight years to complete. It sits on eight acres, and has five bedrooms and 10 bathrooms.

Over-the-top perks include a two-story great room, two-story library with marble floors, a cross-shaped infinity pool, tennis court, guest house, and trout pond.

Meredith Galante contributed to this article.

Welcome to 91008, one of the most expensive zip codes in the country.

The home has a covered walkway, so guests won't get wet.

We love the chiseled columns leading up to the front door.

Charles Bronfman, one of the richest Canadians in business with a net worth of $2 billion, just sold his Fifth Avenue full-floor apartment to hedge fund manager and fellow Canadian David Goel, according to the New York Post.

The sale price was $19.9 million. 

Bronfman inherited his significant fortune when his father left the Seagram wine and spirits empire to him and his brother Edgar. Since Vivendi bought Seagram for $34 billion in 2000, Bronfman has focused on philanthropy. He serves as one of the main benefactors for the Taglit-Birthright Israel, which sends Jewish youth from North America on educational tours of Israel. 

The sixth-floor home Bronfman sold to Goel at 810 Fifth Avenue has views of Central Park, three bedrooms, four bathrooms and a library.

Serena Boardman at Sotheby's International Realty handled the sale. 

The apartment at 810 Fifth Avenue has views of Central Park

The full-floor apartment has 11 rooms total.

It has two wood-burning fireplaces.

Papa John's founder John Schnatter is selling his Utah condo for $17.99 million, making it the most expensive condo ever listed in the state, according to real estate website Zillow.

In 2008, Schnatter purchased the entire top floor of the St. Regis Deer Valley, which is separated into two units. Deseret News reports that the Papa John's magnate will keep whichever unit doesn't sell first.

The furnished unit is No. 1102, which is 6,829 square feet with five bedrooms and seven bathrooms, as well as a ton of amazing features like an enclosed hot tub, grill, wine room, and gourmet kitchen.

The upscale condo also has incredible panoramic views of Deer Valley and Park City from multiple balconies. It's currently listed with Brigid Flint of Summit Sotheby's International Realty, who Deseret News says has been targeting potential buyers in the Middle East.

The other 5,000-square-foot unit for sale is unfinished, so there are no listing pictures. It is listed for $12.5 million, according to Zillow.

Schnatter purchased the entire top floor of the St. Regis Deer Valley in 2008.

Source: Deseret News

The top floor is comprised of two units — let's take a look inside the furnished one that's selling for $17.99 million.

Source: Summit Sotheby's Realty

Welcome to condo No. 1102.

Source: Summit Sotheby's Realty

Legendary Silicon Valley investor Ron Conway is selling his San Francisco home, a 5,360-square-foot flat that takes up the entire floor of a historic co-op building, according to Trulia.

Conway has hosted gatherings featuring a wide array of tech A-listers here, including Marissa Mayer and Twitter co-founder Biz Stone.

He also happens to be close friends with will.i.am and MC Hammer, who together helped Conway film the remix of "2 Legit 2 Quit" that went viral in support of Mayor Ed Lee back in 2011. Clips of the video were filmed on the apartment building's rooftop deck. 

The apartment has 3 bedrooms and 4.5 bathrooms. and recently took a $500,000 price cut, according to Trulia. It's now listed with Pacific Union for $9.5 million. 

The entrance is dramatic, with lots of ornate decorations.

The living area is just down this hallway.

More vintage-inspired details line the walls of this formal sitting room.

A grand mansion in Alabama is the largest home currently on the market in the U.S., according to Curbed.

A virtual Versailles of the South, the Birmingham home is 54,400 square feet. That would be stunning enough, but when added to the square footage of the estate's "equestrian lounge" and two-bedroom guest house, the entire compound becomes a whopping 62,000 square feet.

The incredible home took four years to complete, with artists and architects from Europe handcrafting the stucco, marble, limestone, and decorative features within the home. It is listed with Hurwitz James Company for $13.9 million, a relative bargain.

The 15-bedroom complex also has a 25-seat movie theater, stables, and a 12-car garage.

Welcome to the mini-Versailles in Birmingham, Ala. It is currently the largest listing in America.

Source: Hurwitz James Company

The entire estate covers 27 acres with stables, an "equestrian lounge," and a two-bedroom guest house. (And yes, the landscaping looks like a guitar.)

Source: Hurwitz James Company

The mansion itself is 54,400 square feet, and combined the entire square footage of the property is 62,000 square feet.

Source: Hurwitz James Company

Simon Cowell has officially listed his Beverly Hills bachelor pad, after quietly looking for a buyer for the home in the fall, according to the Los Angeles Times. 

The "X Factor" creator and judge was initially looking to get $20 million for the 12,000-square-foot mansion, but ended up putting the property on the market at $17.9 million instead.

The home was built for entertaining with five bedroom suites, a separate guest house, and a gorgeous swimming pool that lights up at night.

Zillow reports that Cowell is looking for a more family friendly home for himself, girlfriend Lauren Silverman, and their new baby.  

Blair Chang at The Agency is handling the sale. 

Simon Cowell's bachelor pad sits on two acres of land in Beverly Hills.

Source: The Agency

The gated estate has parking for up to 10 cars.

Source: The Agency

The main house has five bedroom suites, seven bathrooms, and two powder rooms.

Source: The Agency

Grammy award-winning singer Rihanna recently celebrated her birthday at a gorgeous $45 million mansion in Aspen, according to real estate website Trulia.

The home — which is currently on the market with Aspen Homes Realty Group— is within walking distance of downtown Aspen with ski access to Aspen Mountain.

The singer posted ample pictures of herself on Instagram enjoying the slopes, as well as partying at the 18,750-square-foot cabin, which has a pool, movie theater, bowling alley, and seven bedrooms.

The open-air style home is perfect for entertaining, with a 40-foot-high foyer entrance, 5 car turntable garage, and even private elevator access to the master suite.

And if Rihanna's snaps of the weekend are any indication, she had a great time turning 26.

Welcome to 1011 Ute Avenue in Aspen, Colorado — the $45 million mansion where Rihanna celebrated her 26th birthday.

Source: Aspen Homes Realty Group

The home sits on .75 acres in CO, and is the perfect place for entertaining.

Source: Aspen Homes Realty Group

It has ski access to Aspen Mountain, which Rihanna took ample advantage of.

Source: Aspen Homes Realty Group

Steve Ells, the founder of America's most popular Mexican fast-casual chain, just sold his townhouse on Jane Street in New York City's West Village to the music mogul who'd been renting the place for the past year, according to Zillow.

The 4,400-square foot Greek Revival first hit the market in September 2012 at $16.5 million, then was reduced to $14.5 million before Lyor Cohen, recently retired from Warner Music Group, scooped it up for $11.4 million.    

The 24-foot wide building dates back to 1858, with a modernized interior including four bedrooms, three family rooms, a wine cellar and a library. 

The Greek Revival townhouse has a facade that dates back to 1858.

Inside, it features a modern library with built-in shelves along two walls.

The building is 24 feet wide with five stories.

Some of the most expensive homes in Los Angeles sit on a handful of streets named after birds in the Hollywood Hills. 

The Swedish DJ Avicii recently joined the ritzy neighborhood, purchasing a $15.5 million mansion, according to Curbed LA. The 7,000-square foot property comes with an impressive water feature that runs the length of the house, ending in a multi-level infinity pool.

The home was designed for a seamless experience between indoor and outdoor living. Most of its five bedrooms have glass walls that can open to the air.

It's not a bad way to live for a 24-year-old DJ who raked in $20 million last year. 

Avicii's Bird Streets mansion in Los Angeles has an impressive facade.

It includes an elaborate water feature that's the length of the house.

The water winds its way from the entryway into an ornamental pool, before flowing into a 75-foot-long lap pool and infinity pool.

This is one mansion that's seriously energy-efficient. 

A home in Newport Beach, Calif., with a 3,000-square-foot solar panel has hit the market for $22 million, according to the Wall Street Journal. 

The home belongs to Stephen Rizzone, CEO and chairman of Pleasanton, Calif.-based tech company Energous Corp. which makes wireless routers.

Rizzone said that the solar panels provide about 95% of the home's power, though their appearance hasn't always been appreciated by the neighbors.

"The house gained some notoriety, good and bad," Rizzone said to the Wall Street Journal. "But we were able to work through that."

The 11,740-square-foot home sits on an amazing lot overlooking Newport Harbor.

Here's a look at those solar panels, which Rizzone says provide about 95% of the home's energy.

According to the listing, this was the first U.S. home over 10,000 square feet to be LEED Platinum-certified.

Bill Maris, founder and managing partner of Google Ventures, has sold his Palo Alto home for its asking price of $2.85 million, according to Realtor.com.

The home has four bedrooms and a beautifully modern design, but the most interesting part of it may be who happens to live next door. 

Maris' former home actually shares a small piece of land with a similarly designed house belonging to Apple CEO Tim Cook. Cook reportedly bought the modest, 2,095-square-foot condo for $1.9 million back in 2010, around the same time Maris moved in.  

The decision to keep a rival close by is interesting, especially considering that other tech executives like Marissa Mayer and Mark Zuckerberg have been known to buy surrounding properties just to keep other people away. 

Maris reportedly moved to Mountain View in 2012, meaning that Tim Cook will soon have a brand-new neighbor. 

The 2,065-square-foot home is situated at the end of an ultra-private driveway, to the rear of Cook's home.

Enter through this glass-paned front door.

The entryway is decorated with some pretty interesting modern art.

Larry David of "Seinfeld" and "Curb Your Enthusiasm" fame has sold his estate in Pacific Palisades for $12 million, significantly less than the initial $15 million asking price, according to Realtor.com.

The mansion, described as a "fairytale home"in the listing, has seven bedrooms and 10 bathrooms. There's a separate guesthouse and fantastic ocean views from the backyard.

For a guy with a curmudgeonly reputation, David's decor is sweet and homey.

The listing describes the house as a "fairytale home." It's not too far off.

Those views are unbeatable.

Plenty of places to enjoy them from.

After Seagram billionaire Edgar Bronfman Sr. passed away, the family listed his penthouse at 960 Fifth Avenue for $65 million in February, The Wall Street Journal reported. 

But it wasn't until recently that Brown Harris Stevens, the firm handling the sale, released interior photos of the 16-room property, according to Curbed NY. Bronfman, who sold his family's spirits empire for $34 billion in 2000, had lived in the prewar co-op for the past 40 years. The full-floor residence has five bedrooms, eight and a half baths, a library and a wrap-around terrace.   

The official listing comes on the heels of Bronfman's younger brother Charles selling his own Fifth Avenue apartment a few blocks south.

The decor in Bronfman's penthouse is somewhat outdated.

He and his family had lived there for 40 years.

The color palette in the 16-room apartment is reminiscent of the 1970s.

But the penthouse still maintains the architectural details common in a prewar building.

The formal dining room has a classical layout.

The apartment offers sprawling views of Central Park.

The wrap-around terrace got a lot of praise when the floor plan was released ahead of the interior photos.

SEE ALSO: Seagram Billionaire Charles Bronfman Sells His Fifth Avenue Flat For $19.9 Million

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After selling New York City's first $100 million townhouse to the nation of Qatar, the A Team — a real estate group headed by brothers Tal and Oren Alexander from Douglas Elliman Real Estate — have another impressive listing on display.

This time, the brothers are representing fertilizer billionaire Alexander Rovt, who's not only selling his Upper East Side townhouse, but a Phantom Rolls-Royce to go along with it, according to the New York Post.

The Rolls-Royce was actually added to the property by the brokers, not the seller, Tal Alexander told Business Insider. It draws extra attention to the fact that the townhouse comes with a private garage, which is rare. 

"This house is going to cater to a Chinese or Middle Eastern buyer," Alexander said. "We know that the Phantom is an attractive car to that type of buyer."

The property spans 25 feet, putting it on the wider end of the city's townhouses. It has five outdoor spaces, including a rooftop patio. The five-bedroom, eight-bathroom home recently underwent renovations that took five years to complete, and now comes with a pool and jacuzzi in the basement.

The home and car are on the market for a total of $25 million.

The Upper East Side townhouse has a width of 25 feet, putting it on the spacious end of New York City's townhouses.

The house has 11,400 square feet with ceiling heights between 12 and 14 feet.

The home features an ornate staircase in the foyer as well as an elevator.

Billy Joel is having an impossible time selling his beautiful Hamptons home. The Piano Man just reduced the price on it from $23.5 million to a mere $22.9 million, Curbed reports.

This isn't the first time Joel's Sagaponack house has been on the market. In 2009, the price was cut from $22.9 million to $16.75 million before it was relisted. The home resurfaced again last November.

The house includes a beachfront view, piano room, and a separate studio situated in the fifth most expensive zip code in the country.

You can see the full listing here. 

This is the view as you enter through the wooden gate.

You can gaze off the patio and look at your 145 feet of oceanfront property.

The home has classic Hamptons shingles.

Another insanely expensive home has hit the Silicon Valley real estate market, according to Curbed. 

This beautiful six-bedroom house is located in ritzy Woodside, Calif., where Larry Ellison's Japanese estate and Steve Jobs' historic mansion can also be found.

The house, which currently belongs to mutual funder Harry Hagey, was designed in the 1980s-era California contemporary style by noted San Francisco architect Sandy Walker. There's a huge pool, tennis courts, and a separate greenhouse. 

The house has some amazing features, but be forewarned: It's listed for a cool $19.95 million. 

The home sits on 6.05 acres of land in Woodside, Calif.

It's a beautifully contemporary home, with floor-to-ceiling windows that make it seem even more spacious.

Trees surround the property, making for a secluded space that would be perfect for someone trying to escape the public eye.

A gorgeous Bel-Air estate formerly owned by country singer Kenny Rogers is on sale for $65 million.

The hillside mansion is technically still under construction after being enlarged from 9,359 square feet to a whopping 24,000 square feet, listing agent Mia Trudeau of Hilton & Hyland told the Wall Street Journal. The home is virtually complete, save for the new guest wing, which will add another two bedrooms and three bathrooms to the home.

Currently, the mansion has nine bedrooms and 14 bathrooms with a ballroom, a saltwater pool, a 12-seat home theater, and even a refrigerated wine room. With two acres of property, the estate also has a tennis court, gym with a sauna, and an outdoor glass elevator next to the pool.

Rogers purchased the home in the ‘70s, according to the WSJ. He added two lion statues to the main gate and renamed the property “Liongate.”

The current sellers of the home are a mystery, but Trudeau told the WSJ that “they are European and purchased the home for personal use,” adding that they put the mansion up for sale because they hadn’t spent enough time in Los Angeles.

The property is currently listed with Hilton & Hyland.

This is Liongate Estate, the 24,000-square-foot property that is currently on sale for $65 million. The home has a tennis court, saltwater swimming pool, and outdoor glass elevator.

Source: Hilton & Hyland

The home sits on two acres of property, and both of its Bel-Air entrances are gated. Rogers was the owner to add those lions to the gate (he's a Leo).

Source: Hilton & Hyland

Let's go inside the mansion, shall we?

Source: Hilton & Hyland

After years on and off the market, Los Angeles' massive Fleur de Lys estate has sold to a "highly secretive French billionaire" for $102 million, making it the most expensive home ever sold in L.A. County, the Los Angeles Times reports.

The home, which was sold by socialite and philanthropist Suzanne Saperstein, has 12 bedrooms, 15 bathrooms, a ballroom, two kitchens, a massive movie theater, a pool, tennis courts, and a nine-car garage. It had previously been listed for $125 million.

According to the LA Times, the 4.6-acre estate was sold after a three-way bidding war among international billionaires, and the winner closed in 10 days in an all-cash deal that included the home's antique furnishings.

Formula One heiress Tamara Ecclestone reportedly showed interest in the house in late 2012, and it was the setting for a much buzzed-about "off with their heads"-themed 40th birthday party for Yammer CEO David Sacks.

Fleur de Lys has a private, gated entrance on N. Carolwood Drive.

It's on more than four acres of land.

In addition to a swimming pool, the estate has two motor courts, a spa complex, and a tennis court.

Last month, Versity Software CEO and co-founder Bruce Gilpin and his partner, pilot Paul Moreno, sold their modern home in San Francisco's Noe Valley neighborhood for $6.75 million.

According to Sotheby's International Realty, which handled the sale, it was the most expensive home ever sold in Noe Valley.

The four-bedroom home is ultra-modern, with incredible city panoramas, according to The Wall Street Journal.

That sale price blows past the neighborhood's average home value of just under $1.5 million, calculated by Zillow. 

Versity is a data storage software company.

The four-bedroom, six-bathroom home has a modern, angular facade.

It has nearly 6,000 square feet, coming out to a cost of about $1,138 per square foot.

A wall of windows offers sprawling views of San Francisco.