Chace Crawford if Gossip Girl made an appearance during Z100's Jingle Ball 2007 on Friday at Madison Square Garden in New York City...

As always, Chace Crawford had fun (and looked hot).

Earlier this week, Chace partied at Marquee nightclub's 4th Anniversary in NYC with none other than American Idol winner Carrie Underwood.

According to OK!, Chace snuck in a "bunch of kisses and cozied up next to [Carrie] all night." Wonder if he'll remain coy about their relationship.

Follow the jump for a few more pictures of Chace Crawford ...

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