Chace Crawford has a prime seat as he hosts the Mercedes-Benz Polo Challenge Saturday at the Bridgehampton Polo Club in Bridgehampton, N.Y.

Later that night, the Gossip Girl star celebrated his 23rd birthday with a white-chocolate cake and 200 cupcakes at a barbecue.

On hand to celebrate? Gossip Girl co-stars Penn Badgley and Blake Lively!

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.