Khloe Kardashian is definitely a genuine Kardashian, according to her mother Kris Jenner.

The mother of the Keeping Up with the Kardashians siblings has brushed off and denied Khloe's two stepmothers' recent claims that she is not the biological daughter of the late Robert Kardashian, whose first wife was Jenner.

"I'm telling you, it just gets weirder and weirder. I have never heard such crap in my life," Jenner told anchor Laura Spencer during a Thursday morning appearance on Good Morning America.

"I mean, I was there. I gave birth. I know who the dad was. Everything's good. We're all good. Don't worry about it."

Jenner added that the storyline of Khloe's questionable roots had been a running joke among the family since her physical features are different from those of the rest of her clan's.

"It's the family joke because Khloe is blonde and not dark-haired. So people, just get a life. I don't know, maybe it makes something relevant for the day and tomorrow it will be something else. It's what you sign up for when you put yourself out there. We're an open book," Jenner said.

According to a RadarOnline report published Wednesday, both of Khloe's stepmothers -- Jan Ashley, who had wed Robert following Jenner's divorce from the late attorney, and Ellen Kardashian, who became his third wife when the couple married him in 2003 just two months before Robert passed away -- have recently come forward saying Robert is not the biological father of Khloe.

"Khloe is not his kid -- he told me that after we got married," Ashley told Star Magazine. "He just kind of looked at me and said [it] like it was a matter of fact. He said, 'Well, you know that Khloe's not really a Kardashian, don't you?' And I said, 'OK,' and that was it."

Ellen Kardashian, who dated Robert for almost six years before they tied the knot, also suggested to Star she was ready to "tell the truth" about the Kardashian family.

Khloe is apparently outraged at her stepmothers' attempts to publicly raise the issue.

"The audacity you have to mention my father's name like this! Should be ashamed of urself! I let a lot of things slide but this one is really low... YOU ARE DISGUSTING! (yes you know who YOU are)" Khloe wrote on her Twitter account Wednesday after reports doubting her paternity first surfaced.