Leighton Meester: Surprise Performance At Cobra Starship Concert!

Leighton Meester poses backstage with Just Jared at the Cobra Starship/Boys Like Girls concert at the Nokia Theater in Times Square, New York City on Tuesday night (November 24).

The 23-year-old Gossip Girl actress hit the perfect style note in head-to-toe Proenza Schouler.

During the concert, Leighton jumped up on stage and sang 'Good Girls Go Bad' with Gabe Saporta and the rest of the band. The crowd went wild — just check out the fun performance below! After the concert, Cobra and Leighton hit up the after-party at 1Oak, sponsored by Op and Nylon.

Earlier in the day, Leighton performed her single 'Somebody To Love' on It's On With Alexa Chung. Watch that performance below too!


Leighton Meester Performs With Cobra Starship, 11/24


Leighton Meester on 'It's On With Alexa Chung'