Party Pics: Inside Katy Perry's Bachelorette Bash

Katy Perry's weekend didn't get off to a great start with the arrest of her fianc� Russell Brand at the Los Angeles International Airport, but the pop star didn't let that stop her from having some fun with her girls in Las Vegas. ET has the pics from Katy's bachelorette party, including shots of her and Rihanna getting down in Sin City.

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