Kris Jenner's former lover was forced to sign a contract to keep silent about the famous family's secrets.

The 58-year-old star - who had an affair with former soccer player Todd Waterman during her first marriage to Robert Kardashian - was ''upset'' when the animator refused to ink the agreement, especially when he said he didn't want her speaking about him.

Speaking to his mother, Ilza Waterman, revealed: ''He asked her 'why?' And she said, 'Even my mother had to sign one.' I think she was joking.

''He said, 'Why would I do that?' He told her, 'I'll sign it if you sign something not to talk about me and to not speak about us anymore.' He said he didn't want her using him in books or newspapers and magazines to build up her public persona.

''She said 'no.' He said she was getting upset. So he just said, 'If it makes you happy, I'll do it.' ''

Although reports emerged that Todd was paid $15,000 to $20,000 to appear on 'Keeping Up With The Kardashians' after his identity was revealed in 2012, his mother insists he never earned a penny for the show.

She added: ''She never paid him for anything.

''When people have a lot of money they never pay for the things that they do. They can always get away with it.''