Posted on Sun Oct 28, 2012 12:00 PM 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!
Hot! But what was her costume?
SEE THE GALLERY Paris Hilton Strikes A Pose At The Playboy Party
Paris Hilton Puts On Her Sexiest Costume For A Halloween Bash - Oct 27, 2012
Paris Hilton And Beau River Viiperi Take In The NYC Aire - Oct 25, 2012
Paris Hilton Lets Beau River Viiperi Take The Lead - Oct 18, 2012
EXCLUSIVE PHOTOS - A Pretty In Pink Paris Hilton Hangs With Her Boyfriend - Oct 18, 2012
Paris Hilton Goes Shopping At Barneys With Her Hot Boyfriend - Oct 17, 2012