Willa Holland of 'The O.C.' joining 'Gossip Girl'

Holland, who played Marissa Cooper’s devilish little sis, Caitlin, on The O.C., is in negotiations to join The CW’s Gossip Girl (which debuted to strong numbers last night) for a three-episode arc, according to a GG source. Holland would play Agnes, a young model for Eleanor Waldorf who befriends Jenny Humphrey (Taylor Momsen) but also tries to tempt her over to the dark side (think threesomes and stripteases).