Gossip Girl (2007) - 2x24 - Valley Girls

In a flashback to the 80s, 17-year-old Lily Rhodes (Snow) gets kicked out of boarding school and runs away to Los Angeles, reconnecting with her parents, Rick (McCarthy) and Cece (guest star Cynthia Watros, "Lost"), and sister, Carol (Ritter). Back in present day, Blair (Leighton Meester) and Nate (Chace Crawford) attend prom together, but the evening doesn't turn out exactly as planned and Chuck (Ed Westwick) has a little something to do with that. Serena (Blake Lively) and Lily (Kelly Rutherford) don't see eye-to-eye over Serena's recent run-in with the law. No Doubt performs in the episode as an 80s band called "Snowed Out."

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