khloe-paternity-claims.jpgRobert Kardashian's ex-wife Jan Ashley claims in a new interview with Star Magazine that Khloe is NOT the late attorney's daughter!

"Khloe is not his kid -- he told me that after we got married," Jan 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, 'OK,' and that was it."

And she's not the only one! Apparently Ellen Kardashian, who married Robert after he separated from Jan, has also come forward to talk about the Kardashian family's secret in the new issue of the gossip glossy.

While Khloe has not yet issued a denial about the report, she did respond to the news on Twitter this morning, and it sounds like she's furious! "The audacity you have to mention my fathers name like this! Should be ashamed of urself! I let a lot of things slide but this one is really low," she wrote. "YOU ARE DISGUSTING! (yes you know who YOU are)." But will she sue? We'll keep you posted!