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But it was during her performance of their single Make Me Wanna Die that Momsen stunned fans by pulling down the neckline of her top and exposing her boobs to the crowd. Her modesty was only spared by two black pasties stuck over her nipples.

Momsen is no stranger to controversy - the Gossip Girl star recently hit the headlines for risque comments she made about pornography and masturbation in a new interview with Revolver magazine. The teenager appears on the front cover in her underwear, thigh-high stockings and high heels as she brandishes a fake gun.