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Hugh Hefner is being sued over claims he 'conspired' with Bill Cosby to drug and sexually assault a teenager at the Playboy Mansion, Daily Mail Online can reveal.

The 90-year-old Playboy boss is named in new legal papers filed on Monday in Los Angeles by a dancer who alleges Cosby attacked her at a party in 2008 at the mansion, when she was just 18.

Chloe Goins claims Cosby gave her a drink and that she later awoke to find herself naked with Cosby biting her toes and with his pants around his ankles.

But she also alleges in papers filed at Los Angeles Superior Court that it was Hefner who told her to lie down because she felt ill after Cosby gave her the drink. 

Her attorney Spencer Kuvin told Daily Mail Online that Hefner needed to be held to account for what he said was 30 years of Cosby's sexual conduct.

'We believe that Mr Hefner not only knew but at the very least should have known what Mr Cosby has been doing to these women over the last 30 plus years,' Kuvin said.

'Thus far no one has been held to account for tacitly standing by knowing what this man was doing.'