Taylor Momsen is finally out of her terrible teens -- the actress turns 20 today!
To be fair, aside from her underage smoking and risque fashion choices, she's been pretty tame, at least compared to people like Miley Cyrus and Amanda Bynes.
Back in 2010, a 17-year-old Taylor made headlines for posing on the cover of Revolver Magazine wearing lingerie and holding a pistol.
Her next spread -- a just-announced shoot with Maxim -- may be even more provocative.
She may be fronting the band Pretty Reckless now, but we'll always remember Tay as cute Cindy Lou in "How the Grinch Stole Christmas" and Jenny Humphries from "Gossip Girl."
To see even more good girls gone bad, click on the "Launch Gallery" link above!