PHOTO GALLERY: The Young and Famous at a GQ Party

Tons of stars showed up at a cocktail party in honor of designer Kris Van Assche and hosted by GQ & Dior Homme at The Cooper Square Hotel Penthouse last night in New York City.

Celebs such as Chace Crawford, Jesse Metcalfe, Mischa Barton, Taylor Momsen, Hayden Christensen and Rachel Bilson showed up for the fashion-friendly bash.

Check out all the action from the party in our new gallery! Hot!