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R&B star Usher was the big winner at the American Music Awards in Los Angeles, picking up all four awards for which he was nominated.

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Usher performed a duet with Alicia Keys at the event on Sunday.

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The American Music Awards celebrated many types of music. Country duo Brooks and Dunn won the favourite country band award for the fourth time.

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Sheryl Crow received the award for female pop-rock artist and adult contemporary artist.

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Crow beat singer and reality TV star Jessica Simpson, who performed on the night.

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Gwen Stefani put on an elaborate show, performing solo without her band No Doubt.

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Bon Jovi were given a special merit award, which lead singer Jon Bon Jovi called "surreal".

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Linkin Park celebrated winning favourite alternative music artist for the second year in a row.

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Kelly Osbourne, pictured with her guest, was one of the presenters at the Shrine Auditorium.

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Rod Stewart was the only British artist performing at the event. He was joined on stage by saxophonist Dave Koz.

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Never one to shun the limelight, Anna Nicole Smith played up to the cameras.

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Maroon 5 missed out on the best breakthrough award but have enjoyed a successful year with the singles She Will Be Loved and This Love.