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

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 college experience. She will be roommates with Vanessa (played by Jessica Szohr).

See photos of the Gossip Girl cast on the beach

Duff will first appear on the hit CW show during next season's fourth episode, scheduled to air Oct. 5. Entertainment Weekly first reported the news.