Some pretty huge claims have been made over the years though despite KJ's best efforts, and it has been suggested that O.J Simpson was her biological father instead.
Hollywood Liferecounted the history of the paternity story, noting: "Soon after the rumors rocked Hollywood, Khloe, Kim Kardashian, 36, and Kris Jenner all took to Twitter to laugh off rumors that Simpson was Khloe's real father". The rumor has never been substantiated.
When asked by TMZ if he wanted to congratulate Khloe on her recent pregnancy news, Simpson replied "Well, for Bob [Robert Kardashian], God bless his soul, yeah. I don't know for me", Simpson said in the video.
He added: "I would be proud ... but trust me, I had nothing to do with it".
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It's been well documented that Simpson and Robert were close friends, with Robert defending Simpson during his trial for the killing of Nicole in 1995, in which he was found not guilty. Nice and terrific and still today I think they are nice and terrific except they have kind of added sex appeal to their resume. It has been said that Khloe bares a striking resemblance to Simpson.
Khloé addressed the rumours previous year, when National Enquirer reported Simpson had changed his will to include her. A conspiracy theory claims OJ and Kris Jenner were up to some bedroom action back in the day.
Khloe is expecting her first child with boyfriend, National Basketball Association star, Tristan Thompson, 27. "I gave birth, I know who the dad was".
HollywoodLifers, did you ever fall for the rumors that O.J.is Khloe's bio-dad?