Seems like Kevin Federline isn’t the only thing Britney Spears has forgotten!  Sources say while partying with Paris Hilton at L.A.’s trendy nightclub Hyde, Spears was spotted without underwear.

The New York Daily News reports:

Spears was snapped with Hilton on Friday night leaving West Hollywood’s Hyde nightclub in a white T-shirt and black mini-skirt (both very Hilton-esque) as well as a pair of Paris’ trademark oversize sunglasses.

While maneuvering out of the cab in the black mini, Spears managed to flash her goods to the throng of paparazzi – and there was an awful lot to see.

Hilton has been Spears’ partner in crime since the mom of two started on her postmarriage trampage around Las Vegas and Los Angeles after only two weeks of being single.

Last week, police were called to Hilton’s home after the celebutante’s neighbors complained that she and Spears were blasting music too loudly and the paparazzi were getting out of control.

Only days before, the newly liberated Spears had a wild “girls night out” with Hilton at Tryst in Las Vegas’ Wynn Hotel. The pair got down and dirty on the dance floor to none other than Paris’ songs. Britney felt so uninhibited hanging with her new pal that she took off her pants and danced around the club in her fishnet stockings.

Watch out, Nicole. We’re seeing a whole new version of “The Simple Life” next season.

For the unedited versions check out thebosh.com.