Below is a sneak preview from Monday's much-anticipated new episode of Gossip Girl, "Valley Girls." The first one takes place on the Upper East Side in 2009.

The scene? The prom. The drama? See for yourself ...

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Follow the jump for four additional sneak previews from the 1980s portion of the episode, starring Brittany Snow (Lily) and Krysten Ritter (her big sister Carol).

The clips - in which the two are seen breaking and entering, rocking out, and stirring up a whole mess of trouble - offer a glimpse of the Gossip Girl spinoff ...

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Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.