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Take a look at the best moments from the 84th Academy Awards ceremony
Jennifer Lopez and Cameron Diaz enjoy a laugh on stage
Jennifer Lopez and Cameron Diaz show off their gowns onstage
Host Billy Crystal entertains the crowds by singing and dancing
Sandra Bullock speaks onstage during the 84th Annual Academy Awards 2012.
Christian Bale introduces Best Actress In A Supporting Role.
Christian Bale presents the Oscar for Best Supporting Actress to Octavia Spencer for 'The Help'
Brad Pitt and Angelina Jolie chat to Meryl Streep during the ceremony
Brad Pitt and Angelina chat to other guests at the awards
Viola Davis and Jessica Chastain congratulate a very emotional Octavia Spencer, winner of the Best Supporting Actress Award 2012.
Robert Downey Jr and Gwyneth Paltrow onstage at the awards. The actors are friends and have co-starred in Iron Man
Robert Downey Jr. and Gwyneth Paltrow fool around for the cameras
Kermit the Frog and Miss Piggy enjoy the Oscars!
Miss Piggy realises she's being papped!
Ben Stiller and Emma Stone onstage during the 84th Annual Academy Awards
Tina Fey and Bradley Cooper onstage during the 84th Annual Academy Awards
Angelina Jolie strikes a pose on stage. The actress's leg got so much attention, somebody created a Twitter account whilst the Oscars were happening! Care to follow Angelina's leg? @AngiesRightLeg
Angelina Jolie presents the Best Screenplay Award.
Angelina Jolie looks incredible in a Versace gown and a highlighted hair
Zach Galifianakis and Will Ferrell perform a hilarious sketch
Funnyman Will Ferrell has the crowds in stitches
Bridesmaids co-stars Rose Byrne and Melissa McCarthy joke around onstage
Performers from Le Cirque du Soleil perform onstage during the 84th Annual Academy Awards
Colin Firth onstage during the 84th Annual Academy Awards. Firth won the Best Actor in a Leading Role award last year for The King's Speech
Ludovic Bource, actress Penelope Ann Miller, producer Thomas Langmann, director Michel Hazanavicius and actress Berenice Bejo accept the Best Picture Award for The Artist.
Tom Cruise looks very chic and youthful at the awards. What's his secret?
Michael Douglas entertains the audience
The Academy Awards pay tribute to the stars who passed away in the last year. Whitney Houston passed away on February 11
The Academy Awards paid tribute to Elizabeth Taylor who passed away in March last year
The Gentlemen Prefer Blondes actress passed away at the end of February 2011
The British director and cinematographer was a casualty of war in Libya in April