From N.Y.C. to Sin City, see how Gaga, Fergie, Rihanna and more popped the cork on 2012
Credit: David Becker/WireImage
Updated: Sunday Jan 01, 2012 | 11:00 AM EST
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Also at Sin City's Chateau Nightclub & Gardens, an expectant Kourtney Kardashian and baby daddy Scott Disick herald the new year by tooting a tune.
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