Making one of her first appearances after recently divorcing Russell Brand, Katy Perry hit the town in Las Vegas on Friday night to attend the grand opening of 1 OAK and the GiveLove charity event with J. Molinari Jewelry designers and pals Markus Molinari and Jason Arasheben.

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“I’m so happy to be here to support my best friend, Markus. I’m so proud of him and absolutely adore his jewelry,” Katy gushed to Just Jared at the Mirage Hotel, opting to turn the focus away from her own personal life, before helping to present a check to the foundation.

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Paris and Nicky Hilton also joined in on the festivities, as well as former Dancing with the Stars contestant David Arquette, his girlfriend Christina McLarty and sister Patricia Arquette.

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