By People Staff
June 24, 2008 06:00 PM
Jeffrey Mayer/WireImage

Hilary Duff is adding yet another credit to her movie career.

According to The Hollywood Reporter, Duff has joined the cast of the comedy Stay Cool. The movie, which shoots in July, also stars Winona Ryder, Sean Astin, Mark Polish, Chevy Chase and Jon Cryer.

The tween star will portray a sexy high school senior who invites an older visiting author to her prom. Most recently, she appeared in War, Inc. opposite John Cusack.

Duff, who is dating New York Islanders Mike Comrie, plans to record her fifth studio album this summer.–Jessica Gold Haralson