J.K. Rowling to Publish First Novel for Adults

Christian Bale and Natalie Portman Last year's big Academy Award winners - Christian Bale, Melissa Leo, Colin Firth and Natalie Portman - will take the stage again on Sunday, but this time as presenters, the academy announced Thursday.Chris Rock to present at OscarsBale and Leo both received Oscars for their supporting roles in The Fighter, while Portman (Black Swan) and Firth (The King's Speech) took home Academy Awards for their lead performances.Hugo, The Artist lead Oscar nominationsThe foursome joins an impressive list of previously announced presenters, including Halle Berry, Bradley Cooper, Tom Cruise, Cameron Diaz, Chris Rock - and even The Muppets, Kermit and Miss Piggy.The 84th Academy Awards, hosted by Billy Crystal, airs Sunday, Feb. 26 at 8:30 p.m. ET/ 5:30 p.m. PT on ABC.