Leighton Meester Performs at American Eagle -- VIDEO

Leighton Meester dons a colorful pair of skintight tie-dye pants as she performs a five-song set at the American Eagle Outfitters flagship store preview party on Tuesday (November 17) in Times Square, New York City.

The 23-year-old Gossip Girl actress performed Cobra Starship‘s hit song “Good Girls Go Bad” as well as “Somebody to Love” (mixed with Sha-DJ — from her producer Shahine Ezell), “Playing Games,” “Not as Cool,” and “Your Love’s A Drug.”

Among the celebs in the crowd: Co-stars Sebastian Stan (her boyfriend), Jessica Szohr, Michelle Trachtenberg and Matthew Settle, as well as Ashlee Simpson, Entourage‘s Adrian Grenier, Ugly Betty‘s Eric Mabius, and designer Christian Siriano.