It's thought that Hugh Hefner's wife Crystal Harris will inherit nothing after his death. 

The Playboy founder has passed away at the age of 91, leaving 30-year-old Crystal a widow. 

But having signed an ircon-clad prenuptial agreement before saying 'I do', it's thought that the former Playmate of the Year will inherit nothing of his multi-million dollar fortune. 

Although Crystal is believed to have never been added to Hef's will, she'll apparently be 'looked after' following his death from natural causes. 

(Image: Reuters)

(Image: Reuters)

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It was reported by US Weekly in 2013 that Hef's $43 million fortune will be divided among his four children, the University of Southern California, as well as a list of charities the star supports. 

Crystal also reportedly called off her first wedding to the publishing legend in 2011 because she got cold feet. 

More than 300 guests were set to attend the ceremony, but were told that it wouldn't be going ahead just five days before. 

She once said of it: "Last time it turned into a big ordeal and then it all fell apart." 

Crystal once publicly shamed her husband when she told the world they'd only ever had sex once, and that it lasted just "two seconds". 

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(Image: Reuters)

She said: "Then I was just over it.  I was like, 'Ahhh.'  I was over it." 

Following their split after she called off the wedding, the pair reunited in 2012 and Hef said he wanted to spend the rest of his life with Crystal. 

And he insisted that their huge 60-year age gap didn't matter. 

He tweeted: "The dramatic age difference between Crystal & me really doesn't matter.  Whatever time I have left, we want to spend together." 

And Crystal said the second marriage was different because she was excited to finally tie the know. 

(Image: REUTERS)

(Image: REX/Shutterstock)

She said: "This time around is amazing... I'm very happy and Hef's very happy and we're excited." 

Crystal was Hef's third wife. 

He married Mildred Williams in 1949 and they divorced 10 years later, and he married Playmate Kimberly Conrad in 1989.  They also separated 10 years later. 

The Playboy boss had four children: Christie, David, Marston and Cooper.