Khloe Kardashian is ticked one of her dad's exes claims he's not her father ... but not for the reasons you'd think.

Ellen Kardashian -- who was married to the late Robert Kardashian after his split from Kris -- came forward a couple years back to say Robert confessed Khloe wasn't his. At the time, Khloe shot down the reports on Twitter, writing, "How can such a piece of trash even mention my father’s name? You married him on his deathbed while he was not even aware of his surroundings."

It was also rumored that O.J. Simpson was her dad -- something she recently laughed off during an interview with Hollywood Today Live.

In a sneak peek clip from this week's "Kocktails with Khloe," Ellen's allegation rears its ugly head again, after guest Alex Mapa asks how she handles living in the public eye.

"You’re one of the most exposed celebrities we have," he says in the video, "there’s so much out there, that leaves you really vulnerable. How do you handle that?"

While she is so open, Khloe admits that there are definitely tough times.

"The thing that most became overwhelming was when this stuff happened with one of my dads wives, she wanted to come out 10 years later after my dad passed away and say that I’m not his daughter, and that he confided in her," the 31-year-old reality star admits. "I was like, listen, you can talk about me and my sisters all you f—king want. Do not talk about my dad. He’s not here."

Robert has become part of the pop culture landscape again recently thanks to David Schwimmer's portrayal of him on FX's "The People v. O.J. Simpson: American Crime Story."

"My sisters [Kourtney and Kim Kardashian], who are older than me, they would be in the courtroom with my dad [Robert Kardashian] all the time," Khloe said on her talk show last week.

"[Our] cars [would] get keyed, like, with ‘guilty’ all over it. People would not allow us to eat at their establishments," she continued. "But cops hated us. Like if they would run our plates, we would get pulled over for anything and everything."

Robert was a part of the so-called "Dream Team" who got O.J. acquitted of the murders of his ex-wife Nicole Brown Simpson and her friend Ron Goldman.

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