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).

http://hollywoodinsider.ew.com/2008/09/the-ocs-willa-h.html