Kim Kardashian isn't staying quiet regarding claims that Khloe is not the daughter of Robert Kardashian.

When asked if she's bothered by the rumors that she calls "completely not true," the 31-year-old reality star tells an X17 photographer:

    "Not really. Not coming from someone that was married to my dad once for two months and one for a couple of weeks."

Kim is referring to her late father's ex wives ... Ellen Kardashian, 63, who married Robert in 2003 for only two months and Jan Ashley, who gave an explosive interview to Star.

Ashley told the mag, "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 ...'Okay,' and that was it."

Ellen went on to say, "Robert did question the fact that Khloe was his. Any normal man would if they knew their wife had cheated on him." Robert's ex also stated that she was told by the late attorney that "his marriage was sexless at the time Khloe was conceived."