After making her surprise appearance at the American Music Awards Britney Spears partied all night at an after-party at Paris Hilton's Hollywood Hills home. She showed up in a jacket and jeans but left in a bare midriff belly dancer outfit showing off her now flat stomach. Her divorce from Kevin must have been weeks if not months in the making as she is enjoying the single life way too much. These pictures have to piss off K-Fed. She's partying at Paris' with Ashlee Simpson, Nicole Richie, and Dave Navarro all the while getting back her old body and he is driving around the country on a tour bus, without any money, shopping at Wal-Mart, and wondering if his next concert will get canceled. The only thing going for him is his impending invitation to appear on the Surreal Life. Pictures by Jonathan Soto Friolo & Alex Turner