The 55th annual Grammy Awards in Los Angeles - in pictures

Photographers are reflected in the helmet of DJ Al Walser, who is nominated for best dance recording, as he arrives at the 55th annual Grammy Awards in Los Angeles. Photograph: Mario Anzuoni/Reuters

Edward Sharpe and the Magnetic Zeros show how much it means being at the Grammys this year. Photograph: Mario Anzuoni/Reuters

Ashanti shows off her Tony Ward Couture gown which featured a slit at the front and keyhole accent at the top. Photograph: Jordan Strauss/Invision/AP

Ben Lovett, Marcus Mumford, 'Country' Winston Marshall and Ted Dwane of Mumford & Sons are nominated for several awards including Best Album for Babel and Best Rock Performance for I Will Wait. Photograph: Lester Cohen/WireImage

R&B singer Estelle steps out in Brian Atwood shoes as she is nominated for Best R&B Performance for her song Thank You. Photograph: Mario Anzuoni/Reuters

Mariachi Divas smile at the Staples Centre. The band is nominated in the category of Best Regional Mexican Music Album for their 8th album, Oye. Photograph: Frederic J. Brown/AFP/Getty Images

Nominees for Best Traditional R&B Performance SWV members make adjustments to their similarly-designed dresses as they arrive on the red carpet. Photograph: Frederic J. Brown/AFP/Getty Images

Justin Timberlake turns the lens on the photographers as they catch him in his Tom Ford suit. The 32-year-old singer is set to make his big comeback performance during the Grammys tonight. Photograph: Jordan Strauss/Invision/AP

Skylar Grey showed off her tattoos with a back baring dress. Photograph: Jordan Strauss/Invision/AP

Musicians Frank Bello, left, and Scott Ian, from metal group Anthrax notched up their fourth Grammy nomination in their career for the song I’m Alive, from the band’s 2011 album Worship Music. Photograph: Jordan Strauss/Invision/AP

Swedish House Mafia, from left, Axwell, Sebastian Ingrosso, and Steve Angello arrive to hear if they have won in the best dance recording category. Photograph: Jordan Strauss/Jordan Strauss/Invision/AP

Karlie Kloss wore a bright blue cutout dress from Michael Kors on the red carpet at this evening's Grammys in LA. Photograph: Jordan Strauss/Invision/AP

The Original Wailers scored a Best Reggae album nomination for Miracle. Photograph: Frederic J. Brown/AFP/Getty Images

Singer Kaya Jones poses as her flowing dress merges with the carpet. Photograph: Mario Anzuoni/Reuters

Canadian actress and TV host Keltie Colleen's dress consisted of a sequined body suit and long skirt easily revealing her legs. Photograph: Frederic J. Brown/AFP/Getty Images

Quezal, a bilingual Spanish-English Chicano rock band from east Los Angeles, California show a range of fashion. Photograph: Frederic J. Brown/AFP/Getty Images

Sean Paul waits to hear if he is number one in the Best Reggae album category for Tomahawk Technique. Photograph: Jordan Strauss/Invision/AP

Halestorm were the first winners of the evening picking up the Best Hard Rock/Metal Performance for their song Love Bites (So Do I). Also nominated in the category were Iron Maiden, Marilyn Manson and Megadeath. Photograph: Frederic J. Brown/AFP/Getty Images