01/11/2012 04:17 pm ET | Updated Jan 11, 2012

Khloe Kardashian Pushes Back Against Paternity Claims

Khloe Kardashian is using Twitter to speak out against the claim, published in Star magazine, that Robert Kardashian was not her biological father.

Her presumed targets: her deceased father's widow, Ellen Kardashian, and his previous wife, Jan Ashley, both of whom told the weekly that Khloe was the product of an affair.

"The audacity you have to mention my father's name like this! Should be ashamed of urself," Khloe tweeted. "I let a lot of things slide but this one is really low... YOU ARE DISGUSTING! (yes you know who YOU are)."

After Robert Kardashian split in 1990 from Khloe's mom, Kris Jenner, he wed Jan Ashley and then Ellen Kardashian -- just two months before his death. Both Jan and Ellen spoke to Star, saying "Khloe is not his kid." But according to a source close to the family, the story couldn't be further from the truth.

"Yes, the story is bullshit so hang tight," the family friend tells me, indicating that there's more to come -- including whether Jan and Ellen were paid to put their names on Star's story. "It's clear this is just another example of someone trying to profit from the girls. Often they sit back and say nothing, but this is too much for them to just ignore."


Khloe & Lamar