Attention Upper East Siders! Hilary Duff is joining the cast of Gossip Girl!

See photos of stars on set.

The actress will join the series for a multi-episode story arc this fall, the CW confirms to Usmagazine.com.

See your favorite Gossip Girl stars from when they were younger.

Duff, 21, will play a movie star named Olivia Burke who enrolls at NYU in search of a traditional, out-of-the-spotlight…

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