Here's a full list of tonight's winners.

Best actress: Meryl Streep - The Iron Lady

Supporting actor: Christopher Plummer - Beginners

Supporting actress: Octavia Spencer - The Help

Adapted screenplay: The Descendants

Original screenplay: Midnight In Paris

Directing: Michel Hazanavicius - The Artist

Animated feature film: Rango

Art direction: Hugo

Cinematography: Hugo

Costume design: The Artist

Jean Dujardin walks off the stage with dog Uggie after "The Artist" won Best Film

Jean Dujardin, Oscar winner for Best Actor for the movie The Artist, addresses the audience

Meryl Streep accepts the Oscar for Best Actress

Documentary (feature): Undefeated

Documentary (short subject): Saving Face

Film editing: The Girl With The Dragon Tattoo

Foreign language film: A Separation (Iran)

Make-up: The Iron Lady

Music (original score): The Artist - Ludovic Bource

Music (Original Song): Man Or Muppet - The Muppets

Short film (animated): The Fantastic Flying Books Of Mr Morris Lessmore

Short film (live action): The Shore

Sound editing: Hugo

Sound mixing: Hugo

Visual effects: Hugo