Robert Kardashian might not be Khloe's biological father?

Khloe Kardashian is lashing out at her former step-mothers claiming the women should be "ashamed" for telling a tabloid magazine that Robert Kardashian isn't her biological father.
Khloe's fury is directed at Jan Ashley and Ellen Kardashian who were each married to Robert after he split from Kris Jenner. Both recently claimed Robert privately revealed to them that Khloe was fathered by another man.
Now, Khloe is firing back on Twitter saying: "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)."

Her sister Kim is saying Robert Kardashian is WITHOUT A DOUBT Khloe's biological father and anyone who suggests otherwise is completely full of crap.
Sources close to Kim tell TMZ the family is fuming at Robert's ex-wives.
One source close to Kris Jenner tells us Khloe's mom isn't even fazed by the rumors because "it's so ridiculous, it's not even worth her time."

The family has been dealing with wild allegations about Khloe's biological dad for a while and even joked about it on their reality show but one family source is adamant, "She looks just like Robert's mother."

I'm not so sure about that one you be the judge!