Nothing says you're classy like pulling at your thong in public, well at least it seems Britney thinks so!  This is what happens when you let alcohol take over.  You lose all sense and do not realize your thong is half way out of your ass!  Supposedly Britney asked that alcohol be kept away from her.  I don't buy that for one minute and apparently no one else did:

“She must have been drinking secretly in the bathroom,” said one. “Because she was falling all over the place. She was also chomping on lollipops from the bathroom all night. And she didn’t leave any money for the bathroom attendant.”

Class act I say, class act.  Source