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From left, Usher, Rihanna, Nicki Minaj, Madonna, Deadmau5,
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From left, Usher, Rihanna, Nicki Minaj, Madonna, Deadmau5, Kanye West, Jay Z and J. Cole onstage at the Tidal launch event at Skylight at Moynihan Station on March 30, 2015, in Manhattan.(Credit: Getty Images / Jamie McCarthy)

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New York City parties

Sienna Miller, Jimmy Fallon, Derek Hough and more stars out and about in NYC.