PHOTO GALLERY: Hilary Duff Joins Gossip Girl

Hilary Duff was spotted getting friendly with Penn Badgley on the set of Gossip Girl in New York City yesterday afternoon.

As we reported last month, Hilary will guest star as Olivia Burke, a movie starlet who enrolls at NYU and rooms with Vanessa (Jessica Szohr).

We wonder what kind of trouble the Duffster will cause in the sexy series? We can’t wait!

For now, check out the new pics of Hilary on the set of Gossip Girl and voice your predictions for her character in the comments section!