Simon Cowell (again)
Simon Cowell owns this $25 million mega-mansion located in the flats of Beverly Hills. The 52-year-old music mogul paid $8 million for the lot in September of 2004 and had the original home demolished to make way for this dream home that he had constructed from the ground up. The recently completed 11,550 square foot manse has 5 bedrooms, 6 bathrooms, a state-of-the-art gym, luxury spa complete with wet steam room, lap pool, guest house, high-tech media theatre and a solarium.