From N.Y.C. to Sin City, see how Gaga, Fergie, Rihanna and more popped the cork on 2012
Credit: Angela Weiss/WireImage
Updated: Sunday Jan 01, 2012 | 11:00 AM EST
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Singer Bruno Mars caps off a blockbuster year – which included winning a Grammy, a Billboard Music Award and an American Music Award – with a sweet celebration at Las Vegas's The Bank Nightclub at the Bellagio.
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