Live photos: Weezer dressed up as bugs at their Halloween party, plus special Gossip Girl guest

"Weezer fans have the Halloween spirit!" declared Rivers Cuomo, at Weezer's Hammerstein Ballroom Halloween party, Saturday night. The band took the stage dressed as bugs, following sets by Matt & Kim and PT Walkley, and TONY photographer Lizz Kuehl was there to catch the action. The band also welcomed a special guest onstage for its new single, "(If You're Wondering If I Want You To) I Want You To"—Gossip Girl Leighton Meester. Check the vid after the jump.