Britney Spears -- Butthead

Britney Spears took out the trash when she filed for divorce earlier this month, now she's gotten just plain sloppy and it's crossed the legal line.

TMZ cameras caught the newly hot Britney leaving Hyde nightclub in West Hollywood Friday night with new BFF Paris Hilton. Brit took a drag off of a cigarette and and then cavalierly flicked it out of a car window.

Hey Britney, in case you need to bone up on the law: throwing a lit cigarette from a moving vehicle is criminal misdemeanor, punishable by a $1000 fine.