Hugo Becker as Louis, Penn Badgley as Dan Humphrey, Ed Westwick as Chuck Bass, Chace Crawford as Nate Archibald, Leighton Meester as Blair Waldorf, and Blake Lively as Serena van der Woodsen in a dream sequence from the 100th episode of "Gossip Girl."

Hugo Becker as Louis, Penn Badgley as Dan Humphrey, Ed Westwick as Chuck Bass, Chace Crawford as Nate Archibald, Leighton Meester as Blair Waldorf, and Blake Lively as Serena van der Woodsen in a dream sequence from the 100th episode of "Gossip Girl."