Gossip Girl (2007): Season 1, Episode 16

1 - 16: All About My Brother

Georgina informs Serena that she is prepared to reveal damaging information from Serena's past, but no one is prepared for what Georgina does next. Blair and Jenny escalate their "popularity war" by spreading scandalous rumors about each other through Gossip Girl. Dan witnesses Jenny's new boyfriend, Asher, cheating with another boy who we find out to be Eric, Serena's brother, but Jenny refuses to listen to her brother's warning. Rufus goes to Lily for advice on how to handle Jenny's recent out-of-character behavior.