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Lady Gaga, Rihanna and Will.i.am welcome in the new year in style at a host of celebrity parties.
Rihanna wears long black lace dress as she attends Sean 'Diddy' Combs' CIROC The New Year 2012 private party in Miami.
Fergie was joined by the likes of Kanye West as she hosted a party to celebrate the premiere of the 1OAK Las Vegas at the Mirage Hotel and Casino.
Lady Gaga presses the button which drops the famous ball into the crowd at Times Square New York to bring in the new year.
Lady Gaga performed a medley of her biggest hits including 'Marry The Night' and 'Born This Way' to over one million people in Times Square on new year's eve.
Justin Bieber performed for the huge crowds and covered The Beatles' famous hit 'Let It Be' at the new year's party in New York's Times Square.
Leigh-Anne Pinnock and Jesy Nelson of Little Mix celebrated the start of the new year at the Mahiki Club in London.
Pitbull wrapped up against the cold as he helped ring in the new year with a performance at New York's Times Square.
Will.i.am performed a DJ set and hosted a party at the Surrender nightclub at the Encore hotel in Las Vegas.
Leona Lewis celebrated the New Year in style at the grand opening of the Hyde Bellagio nightclub in Las Vegas.
Nicki Minaj performs on the 40th Anniversary of Dick Clark's New Year's Rockin' Eve show.