Below is the first promo for next Monday's episode of Gossip Girl, "The Last Days of Disco Stick." Looks like threesome becomes lonesome for Dan, who has to face the fallout from hooking up with his best friend and his girlfriend ... together.

Oh, Dan. Take a look at tell us what you think will happen as the gang struggles with the aftermath of its quest to complete the ultimate college checklist ...

[video url="http://www.tvfanatic.com/videos/the-last-days-of-disco-stick-promo/" title="The Last Days of Disco Stick Promo"] [/video]

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