Along with best picture-nominated movie "The Help," Stone has appeared in "Crazy, Stupid, Love," "Friends with Benefits," "Easy A" and "Superbad."
Stone joins the list of previously announced Oscar presenters: Penelope Cruz, Angelina Jolie, Cameron Diaz, Halle Berry, Tom Cruise, Tom Hanks, Jennifer Lopez and the cast of "Bridesmaids," including actresses Rose Byrne, Ellie Kemper, Melissa McCarthy, Wendi McLendon-Covey, Maya Rudolph and Kristen Wiig.
The 2012 Academy Awards ceremony takes place on Feb. 26 at the Kodak Theatre in Los Angeles and will air live on ABC7.
The event will be hosted by actor Billy Crystal in what will mark his ninth such stint.
Oscar.com hosts the official Oscar blog, which will feature red carpet fashion trends and tips from chef and lifestyle experts for hosting the best Oscar party.
OnTheRedCarpet.com will have complete coverage of the Oscar season, including an exclusive interactive live stream show LIVE from the red carpet. Follow @OnTheRedCarpet on Twitter and "Like" On The Red Carpet on Facebook, and download our FREE entertainment news app for the iPhone and iPad.