The 84th Academy Awards, hosted by Billy Crystal, is taking place at the Kodak Theatre in Hollywood.
The nominees and other celebrities have started arriving for the ceremony. Among them, one who has received a lot of attention is Christopher Plummer, who could become the oldest to win the award.
He has been nominated for the best supporting actor Oscar for his performance in the movie Beginners. In this movie, Plummer, 82, has impressively essayed the role of a recently widowed man, who comes out of the closet and embraces his homosexuality.
Plummer has already swept the major awards including the Screen Actors Guild, Golden Globe, BAFTA, and Critics' Choice prizes for the same role.
He was previously nominated for an Oscar for his supporting role in the 2010 film The Last Station.
Plummer is best known for his role as Captain Von Trapp in the 1965 film classic The Sound of Music opposite Julie Andrews.
Sacha Baron Cohen arrived dressed up as his character in the upcoming film The Dictator.
The other celebrities who arrived early include French actor Jean Dujardin (best actor nominee for his role in The Artist), British actor Gary Oldman and Viola Davis (best actress nominee for her role in The Help).