Nicole Richie (pictured right) will guest star on an episode of NBC's "Chuck" when it returns in the fall. According to the network, Richie will play a ''snarky and spiteful girl who tortured" Special Agent Sarah Walker (Yvonne Strahovski). Agent Walker is reunited with her former nemesis when a mission forces her to attend her 10-year high school reunion with Chuck (Zachary Levi) as her date.

PHOTO: ic.gc.ca