Oscar producers Brian Grazer and Don Mischer made the announcement on Monday.
It was previously announced that the cast of "Bridesmaids," including actresses Rose Byrne, Ellie Kemper, Melissa McCarthy, Wendi McLendon-Covey, Maya Rudolph and Kristen Wiig, would also be presenting at the awards show.
McCarthy is nominated for her supporting role in "Bridesmaids," and Wiig was nominated for the film's original screenplay. It will be the first Oscar show appearance for all six actresses.
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.