“Gossip Girl” was full of fun cameos and guest stars. The CW teen drama ran for six seasons and featured a ton of celebrities.
Before he was in “The Social Network,” Armie Hammer was a jerk who messed with Blake Lively’s Serena van der Woodsen, and “Jessica Jones'” star Krsyten Ritter played Lilly’s sister in flashbacks. Then, you’ve got some cameos from model Karlie Kloss and Lady Gaga playing themselves.
In honor of the show’s 10th anniversary September 19, here’s a look back at some of the best celebrity surprises.