Las Vegas Britney's back... and she's showing her backside. The soon-to-be ex-Mrs. Federline has been working on her new album in Sin City. But she found time for play as well -- partying and chain-smoking with her new BFF Paris Hilton on Saturday. Things actually got so hot, the mother of two ditched her pants -- and danced around a club in a pair of fishnets!
Just when we thought the celeb life couldnt be any blonder or sleazier... Thank goodness these two can prove us wrong!