Brittany Snow poses for a mug shot in the first poster for "Valley Girls," an upcoming episode of "Gossip Girl" – and the backdoor pilot for its as-yet-untitled '80s-era spin-off.
While Kelly Rutherford plays Lily van der Woodsen, the New York mother of Serena and Eric, Brittany plays the future mom during her wild youth in LA's San Fernando Valley as Lily Rhodes – who apparently got into as much trouble as her daughter back in the day.
VIEW THE PHOTOS: Brittany Snow
The episode airs Monday, May 11 at 8 PM on The CW.
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