After putting on his serious face at the Service Summit in NYC on Thursday [1], Leonardo DiCaprio shifted his cap to the side and partied it up at 1OAK on Saturday night to celebrate the birthday of the club's co-owner, Richie Akiva. He chatted with Diddy and posed for photos with Usher and his BFF Lukas Haas, who even had a bit part in last night's Entourage [2], which you all are still loving [3]. Looks like Rachel Zoe is still drinking to her new show you're also fans of [4], while Emmanuelle Chriqui and Lindsay Price were a couple more pretty faces in the crowd.
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To see more photos including Lindsay Price, Usher, and Robin Thicke, just .
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Images include: Leonardo DiCaprio, Lukas Haas, Usher, Diddy, Richie Akiva, Lindsay Price, Emmanuelle Chriqui, Rachel Zoe, Robert Buckley, Robin Thicke
Startraks Photo [5]