The cast of Gossip Girl took last night off from working on their show to toast their costume designer Eric Daman at an event for his book You Know You Want It in NYC. Eric had his leading ladies on the red carpet for support, with Blake Lively, Leighton Meester, Jessica Szohr, and Michelle Trachtenberg coming out for the bash. Ed Westwick and Sebastian Stan accompanied their girlfriends, as did a newly dark-haired Olivia Palermo. Leighton and Olivia have stepped out to celebrate Eric and his style guide before, but it looks like this time around they had almost the whole Upper East Side gang there to join in on the fun.
To see more from the party, just read more.