Hugh Hefner, American founder of the international adult magazine Playboy, has died at the age of 91.

Hefner reportedly passed away peacefully at home in Los Angeles, from natural causes.

Hefner began publishing Playboy in his kitchen in 1953.

It became the largest-selling men's magazine in the world, shifting seven million copies a month at its peak.

Cooper Hefner, his son, said he would be "greatly missed by many".

He paid tribute to his father's "exceptional and impactful life as a media and cultural pioneer," and called him an advocate for free speech, civil rights and sexual freedom.