Joining Bridges and Bullock as Oscar presenters will be fellow acting nominees Matt Damon, Anna Kendrick and Carey Mulligan and directing contender Quentin Tarantino.
Bridges is the best-actor favorite for "Crazy Heart" at Sunday's show, and Bullock is widely expected to win best actress for "The Blind Side."
Mulligan also is nominated for best actress for "An Education." Damon is up for supporting actor in "Invictus," and Kendrick is up for supporting actress for "Up in the Air."
Tarantino is nominated for "Inglourious Basterds."