From N.Y.C. to Sin City, see how Gaga, Fergie, Rihanna and more popped the cork on 2012
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Updated: Sunday Jan 01, 2012 | 11:00 AM EST
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Shameless star Emmy Rossum turns up the heat in a strapless red dress during an appearance on NBC's New Year's Eve with Carson Daly in N.Y.C.
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