Silent movie The Artist has won best picture, best director for Michel Hazanavicius and best actor for Jean Dujardin at the Oscars.
French composer Ludovic Bource also won the award for original score for his work on the black and white film.
Meryl Streep won best actress for her portrayal of former British Prime Minister Margaret Thatcher in The Iron Lady - her 17th Oscar nomination.
Canadian actor Christopher Plummer became the oldest Oscar winner at 82 for his portrayal of a father who comes out as a gay man after his wife dies in Beginners.
The Help's Octavia Spencer won the best supporting actress Oscar and gave an emotional acceptance speech.
The Artist also won a total of five awards.
Iran's A Separation became the first Iranian film to win an Oscar when Sandra Bullock presented director Asghar Farhadi with best foreign language film.