Cooper's film credits include "The Hangover Part II," "Limitless," "Valentine's Day," "He's Just Not That Into You," "Yes Man," "Failure to Launch" and "Wedding Crashers."
He will be seen next in "The Words" and later this year in "The Place Beyond the Pines" and "The Silver Linings Playbook."
Rock, a Grammy-winning comedian, served as host of the 77th Academy Awards. He recently starred in the Tony nominated play "Mother F**ker with the Hat," and also lent his voice to the upcoming "Madagascar 3: Europe's Most Wanted."
His other film credits include "Grown Ups," "Deaths at a Funeral," "Good Hair," "Bee Movie" and the first two "Madagascar" animated movies.
Cooper and Rock join the list of previously announced Oscar presenters including Emma Stone, Halle Berry, Rose Byrne, Tom Cruise, Penelope Cruz, Cameron Diaz, Tom Hanks, Angelina Jolie, Milla Jovovich, Ellie Kemper, Jennifer Lopez, 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.