Leighton Meester Joins Weezer On Stage In New York City

Weezer fans who attended their Halloween gig at New York City’s Hammerstein Ballroom got a really sweet treat when the band rocked out with Gossip Girl‘s resident badass glamorpuss and upcoming pop tart Leighton Meester.

Frontman Rivers Cuomo traded verses with Meester on “(If You’re Wondering if I Want You To) I Want You To,” the first single from their new album Raditude, while another guest, Nat Wolff from the Naked Brothers Band, played guitar.

Raditude hits stores tomorrow (November 3) while Meester’s debut set is expected spring of 2010.