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.
O.J. Simpson denied a decades-old rumor that he is Khloe Kardashian's real father, saying he has "nothing to do with it". The rumor has never been substantiated.
The ex-con addressed rumours he fathered the reality star, instead of the late Robert Kardashian, when asked if he wanted to congratulate Khloe on her pregnancy. "I don't know for me", Simpson said in the video. "I don't think I have anything to do with it'".
Simpson, 70, added: "I'm happy for them, congratulations to her, but trust me I have nothing to do with it".
Fans of KUWTK will remember that Khlo-money even had doubts at one point herself over her parents, forcing mama Kris Jenner to step in and shut down the rumours with a DNA test.More news: Dylan Farrow Wants To Know When Woody Allen's Time Will Be Up
"Watch O.J.'s daughter, Arnelle, in the background - she's CONVINCED her dad's no Kardashian creator", TMZ said.
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.
In Kris' memoir she admits to cheating on her first husband, but does not name who with. Kris had admitted to having an affair around the same time Khloe was conceived, Life and Style Magazine reported. I was like, 'Listen, you can talk about me and my sisters all you f**king want.
She also previously hit out at her late dad's second and third wives after they claimed Robert, who died from cancer in 2003, told them he wasn't her dad.
Simpson was sentenced to 33 years for armed robbery for attempting to steal sports memorabilia in 2008, and was released last year.