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Last night, Katy Perry celebrated the premiere of her new music video, "Waking Up in Vegas," at Mr. West nightclub in NYC, and it looks like the singer had a blast!

Katy's on again/off again boyfriend, Travis McCoy showed up, as well as Rihanna and a mini-Katy Perry from Jeff Beacher's Madhouse. Katy spent time chatting with her lookalike, and the ladies posed for photos and partied the night away. Rihanna, Travis and Katy hung out at their VIP table and drank Svedka vodka until the wee hours of the morning, occasionally taking breaks to snap pictures and dance. Sound like a great party to us!