Gossip Girl (2007): Season 2, Episode 13

2 - 13: O Brother, Where Bart Thou?

A sudden and tragic event. Blair has something important to say to Chuck... but it's said at a bad time. When Serena decides to travel to Argentina with Aaron, Dan decides to express his feelings for her, but is it too late? Meanwhile, Cyrus and Eleanor get married. And Rufus discovers something that Lily has been keeping from everybody for a long time.