Posted on Sun Oct 28th, 2012 12:00pm PDT
Paris Hilton and boyfriend River Viiperi posed for photos before heading to the Playboy Halloween party last night, and once she got inside she tweeted, "#YES! @Iamdiddy killing it on the mike performing all his hits! #CirocFlowingAtThePlayboyMansion! #BestHalloweenEver! :D."
In addition to P. Diddy, stars like Chris Brown and David Hasselhoff were also at the bash ... click the gallery below for more photos!
SEE THE GALLERY Paris Hilton Strikes A Pose At The Playboy Party
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