David Saperstein

Pop diva Mariah Carey has reportedly made an offer on Fleur de Lys, the world's most expensive estate, which is listed at $125 million. The the palatial 15-bedroom mansion in Beverly Hills (above) was built by Texan billionaire David Saperstein. The five-acre estate is home to a 41,000-square foot French limestone mansion inspired by France's magnificent Vaux le Vicomte palace outside Paris. It features Italian marble walls, French limestone floors, gold-embossed leather wall coverings, gold-leaf crown moldings, a ballroom with ceiling frescoes, a library complete with rare books, two kitchens and a screening room with seating for 50.

Surrounding the mansion are rolling lawns, ornamental gardens and mature trees, a 3,000-square-foot manager's house, staff quarters for 10 people, a spa and pool with a pavilion, a championship tennis court, and a lavish garden folly. Contactmusic reports that after three months of house hunting Carey and her rapper / actor husband Nick Cannon have made an offer on the estate, for an undisclosed amount. "They like the home because there's so little that needs doing to it," a source close to the couple allegedly remarked. The house is currently owned by Saperstein's ex-wife Suzanne, whom he ditched for the childrens' hot Swedish nanny.

The Wall Street Journal's Private Properties and the Real Estalker both recently reported that Metro Networks founder David I. Saperstein is asking $75 million for Hummingbird Nest Ranch, an equestrian estate in Simi Valley, California. Yes, the same Sapersteins who are selling Fleur-de-Lys, the $125 million palace in Beverly Hills. The now ex-Mrs. Saperstein, Suzanne, is an avid rider and the couple bought the 123-acre ranch in the 1990s and turned it into an elaborate showplace. The ranch includes a 12,500-square-foot, Mission-style main house, six guest houses (one of which is a brick beauty from the 1920s known as Sitting Bull) and 10 factory-built homes for staff quarters. There is also a a roughly 20,000-square-foot barn with 37 individually heated stalls and an automated horse watering system, three show rings, a veterinary clinic and of course a helipad.

If you are a fan of the television show, The Biggest Loser, then you have probably various portions of this estate. The first few seasons of the show were filmed here (plenty of room for all that exhausting hiking around). The ranch is a functioning business hosting equestrian events, all sorts of filming, and boarding horses. The main house has a Moroccan feel with lots of beautiful tile details, heavy iron chandeliers and rustic wood beams. It's huge but still has, as the Real Estalker Mama notes, a certain coziness. The estate is listed at $75 million. After the jump., can you imagine the water bill for keeping all that green during a Southern California summer?