With Rachel Bilson and Melinda Clarke already making guest appearances on Chuck [1], it should come as no surprise that Josh Schwartz likes to keep his OC [2] alumni busy with jobs on his shows. The latest: Willa Holland, The OC's (second) Kaitlin Cooper, who will appear on Gossip Girl [3] tonight.

Holland stars in the first of three episodes tonight as Agnes, a young model who becomes a friend of Jenny's and will have a big influence on Little J's career aspirations. According to Holland [4], "Agnes sees Jenny as somebody who’s not working for herself; she’s working for everybody else. She has a lot of talent and potential, so Agnes pushes her to get out on her own." She also may turn out to be a bit of a flake — but a well-intentioned one.

This episode also puts Taylor Momsen's dramatic haircut [5] in full effect, along with what appears to be an entire drugstore worth of eyeliner. In other news, Serena's going to click with a new guy (an artist named Aaron Rose, played by John Patrick Amedori), and Blair and Chuck continue their little games. To watch a preview, just .

Photo courtesy of The CW [6]