Last night, Taylor Momsen (aka Gossip Girl's "Little Jenny") celebrated her 16th birthday at the Hiro Ballroom in Manhattan by playing a show with her band, Pretty Reckless. We admit we were skeptical at first, both because we are fearful of actor/musician crossovers in general, and because our favorite Gossip Girl side project is already Leighton Meester's. But, truth be told, Lil Jenny blew us away with her powerful singing voice! At first we thought we might simply be impressed because we were kind of jazzed at seeing Chuck Bass and Dan's Dad in real life (they were up front by the stage and rocking their faces off), but when we closed our eyes and pretended like she was just some schlub from Jerz, it still sounded awesome: a boozy worldwise rasp with a wicked patina of Jett, Cobain and Hynde. All her songs are about her ex-boyfriends, apparently, so don't be a douche if you date her. We flipcammed the whole thing.