Hugh Hefner is privately supporting Kendra Wilkinson amid rumours her marriage on the rocks.

The Playboy mogul, 88, has reportedly reached out to his ex-girlfriend, 29, several times in the wake of allegations her husband, Hank Baskett, cheated on her with a transsexual model.

A source close to the businessman, who dated Kendra for four years until 2008, told Us Weekly magazine: ''He told her to come to the Playboy Mansion any time. He's been supportive and hates that Kendra is going through this.''

Former NFL star Hank, 31, who has two children, Hank IV, four, and Alijah, seven-weeks, allegedly cheated on his wife of four years with Ava Sabrina London while she was eight months pregnant with their second child, and the blonde beauty is said to be ''still in shock.''

A source previously revealed the former model is ''inconsolable'' and moved three of her friends into her mansion in Los Angeles to help her cope with her heartbreak.

The insider added: ''She will never get over this. They are 100 per cent done.''

Hugh, who is now married to 28-year-old beauty Crystal Harris, dated Kendra while he was also romancing Holly Madison and Bridget Marquardt, and their unusual relationships were the focus of the reality TV series 'The Girls Next Door.'