Christina Aguilera – $13.5 Million, L.A.

Since Aguilera’s L.A. mansion had been featured in a number of design magazines, it must be on our list, too. Known for her exceptional taste in style, the pop diva made sure to include every possible color scheme while decorating her $13.5-million pet-project. Besides a walk-in closet-room and enough space for her vast collection of designer shoes, the 11,000-square-foot mansion boasts a recording studio, game and arcade rooms, complete with all her kids’ fave arcade games, and pinball machines. We’re wondering just how high the property tax is for such a lavish home.