Hilary Duff has signed on to add another movie credential to her resume. The comedy "Stay Cool" written and directed by Michael and Mark Polish just added the teen pop star to their cast along with Winona Ryder, Chevy Chase, Sean Astin and John Cryer.

According to Real Movie News.com Duff will be playing the role of Shasta O'Neil, a seductive high school student who asks the successful author/commencement ceremony guest speaker (Polish) to prom. This comedy is scheduled to be released sometime next year. Watch the review of the last movie she was in "War Inc." by clicking here or on the picture.