From N.Y.C. to Sin City, see how Gaga, Fergie, Rihanna and more popped the cork on 2012
Credit: Michael Tran/WireImage
Updated: Sunday Jan 01, 2012 | 11:00 AM EST
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Designer Lauren Conrad and former fellow The Hills star Stephanie Pratt make a stylish statement at the Hyde Bellagio celebration in Las Vegas, where Leona Lewis, Wilmer Valderrama and Eliza Dushku were among the revelers.
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