Justin Bieber, Paris Hilton and More Attend the Annual Casamigos Halloween Party

Paris Hilton, Justin Bieber in Costume for Star-Studded Halloween Party

Booby Tape founder Bianca Roccisano dons racy transparent dress as she arrives for her A-List Halloween party alongside Paris Hilton in Los Angeles

Paris Hilton and Demi Lovato get in the Halloween spirit in fun costumes as they lead A-list partygoers at star-studded bash in LA