It only took Britney Spears one night of hanging out with Paris Hilton to start running around without her pants.
The newly-liberated pop star enjoyed a wild 'girls night out' in Sin City with Miss Hilton this weekend; dancing, laughing and chain-smoking throughout the night.
The unlikely pair landed at club Tryst in the Wynn hotel, where Britney was spotted getting down and dirty on the dance floor to several Paris Hilton songs. In fact, things got so heated, Britney ditched her pants -- and danced around the club in a pair of fishnet stockings!
Welcome back, Brit.