21 Celebrity Reactions to Playboy Founder Hugh Hefner's Death

From Paris Hilton to Kim Kardashian to Pamela Anderson, celebrities came out in full force to mourn the loss of Playboy founder Hugh Hefner, who died at his home last night at the age of 91.

Hefner died of natural causes and surrounded by his loved ones, and celebs paid tribute, shedding a touching light on the Playboy mogul.