Hugh Hefner died yesterday of natural causes at the Playboy Mansion in L.A., surrounded by his loved ones. He was 91 years old.

Hefner kick-started the sexual revolution when he published the first “Playboy” magazine in 1953 with Marilyn Monroe as his first ‘Playmate.’

Some of the money he used to launch the magazine came from his strict MOM.

Hugh had four kids and was married three times: To Mildred Williams from 1949 to 1959 to Kimberly Conrad from 1989 to 2010 and to Crystal Harris from 2012 until his death. She’s 31 years old.

Hugh Hefner’s son said, “My father lived an exceptional and impactful life as a media and cultural pioneer. And a leading voice behind some of the most significant social and cultural movements of our time in advocating free speech, civil rights and sexual freedom.”

His final resting place will be a crypt next to Marilyn Monroe’s at the Westwood cemetery in Los Angeles.

Tons of celebrities are paying tribute..