The puffy-lipped songstress, Britney Spears complete with a slutty Halloween costume partied at Winston’s club in Hollywood with cousin Alli Sims on Monday night.

Ok! Magazine reports that inside Winston’s Brit asked to change with the bartender.

A source said, “While waiting for a (bathroom) stall to open up, Britney turned to the bartender, who was wearing a low-cut black dress, and said, ‘you have nice tits! Mine are all saggy’!”

Brit then told the bartender to switch clothes with her.