Kevin Winter/Getty
People Staff
September 14, 2011 10:00 AM

In the Big Apple, Justin Timberlake had a guys’ night out with Diddy and a group of friends at the launch party for the fashion line Love by Isabel Adrian. And it was a late night: Timberlake arrived after 2 a.m., listened to music, drank champagne and danced to house music. “Justin was really letting go and enjoying himself,” an onlooker tells us.

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