Taylor Momsen -- Lingerie Shocker at Bieber Premiere

2/9/2011 9:40 AM PST

Taylor Momsen -- Lingerie Shocker at Bieber Premiere

Sporting a pair of thigh-high stockings and cloaked in desperation ... 17-year-old "Gossip Girl" star Taylor Momsen kept it classy at the L.A. premiere of the new Justin Bieber movie last night.