All four have been nominated for Oscars in the past. McCarthy was a Best Supporting Actress nominee for her role as a crass, but lovable member of the wedding party in "Bridesmaids" (2012).
Neeson was among the Best Actor nominees in 1993 for his performance as a Nazi profiteer turned unlikely hero in "Schindler's List."
Hayek Pinault (who now apparently goes by her married name) was nominated for Best Actress in 2002 for her work as unibrowed Mexican painter Frida Kahlo in "Frida."
Travolta has two Oscar nominations to his credit — one for his 1977 breakout performance in "Saturday Night Fever" and another for his 1994 comeback role in "Pulp Fiction."
Previously announced presenters include a smorgasbord of current nominees, last year's winners and big named co-stars from 2012's top grossing films.
Ben Affleck, Jessica Chastain, Jennifer Lawrence, Sandra Bullock, Mark Wahlberg,and "Marvel's The Avengers" cast members Robert Downey Jr., Samuel L. Jackson, Chris Evans, Jeremy Renner and Mark Ruffalo are among those taking the stage.
The Oscars will be hosted by Seth MacFarlane and will be telecast on Feb. 24.