US TV
Rex Features
The socialite will play a "spiteful girl", who tortured Yvonne Strahovski's character Sarah Walker when they were at school together, according to The Hollywood Reporter.
Sarah is forced to meet up with Richie's character at a school reunion while on a mission with Chuck.
Executive producer Josh Schwartz said: "Nicole auditioned for the part and was very funny.
"This role is a great opportunity for her to show off her comedic skills and be diabolically evil and kick some butt. It's going to be really fun."
Richie's appearance will air in the autumn.
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