From N.Y.C. to Sin City, see how Gaga, Fergie, Rihanna and more popped the cork on 2012
Credit: Michael Loccisano/Getty
Updated: Sunday Jan 01, 2012 | 11:00 AM EST
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Also at the NIVEA Kiss Stage in N.Y.C., Cee Lo Green wows the crowd with his take on John Lennon's "Imagine" for NBC's New Year's Eve with Carson Daly special.
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