Lily Allen is making quite the ass of herself in Cannes (and showing a lot of boobies along the way)!

According to reports, the bratty Brit was kicked off a fancy yacht party this weekend because of her boozy, classless behavior.

The tipsy pop tart apparently ripped off her bikini top and threw herself off the side of the boat during the party! The yacht crew had to fish her out of the Med because she looked like she was about to drown.

Once she was back on board the party host (some Formula 1 big wig) covered her up with her dress because he was embarrassed by her inappropriateness. She was then told, more or less, to get the hell out of the party.

Clubbing in the City is one thing — partying Cannes is done differently.

What a piece of trash!

[Image via WENN.]