The disgraced NFL star was asked whether he wanted to congratulate Khloe on her prengancy, and he told TMZ: 'Well, for Bob [Robert Kardashian]. God bless his soul, yeah. I don't know for me. I don't think I have anything to do with it.'
'I would be proud ... but trust me, I had nothing to do with it,' he finished.
The subject of Khloe's paternal father has long been a subject of speculation, ignited by Kris' confession that she had not been faithful during her marriage to Robert.
In Kris' memoir she admits to cheating on her first husband, but does not name who with. She does however maintain that it was not Simpson.
Robert's second and third wives have also claimed that the late-Kardashian told them both that Khloe was not his child.
Robert died of cancer in 2003.