Gossip Girl

Is the Upper East Side big enough for Blair, Serena and ... Hilary Duff? It better be, as the actress is joining Gossip Girl for a multi-episode story arc this fall!

The actress-designer-pop singer will be playing Olivia Burke, a movie star who enrolls at New York University "in search of a traditional college experience."

There, she room with one Upper East Sider we know - and romance another!

Follow the link to read more about Hilary Duff on Gossip Girl ...