Khloe Kardashian has spent years wondering if she is really a Kardashian and even made it part of her TV show, by taking a DNA test. But RadarOnline.com has learned there was one major flaw — she only tested the maternity with her mother Kris Jenner, and did no paternity test to prove that Robert Kardashian is her father.

In April 2009, an episode of Keeping Up With The Kardashians aired in which Khloe wanted to prove once and for all she was not adopted, so she took a DNA test.

But interestingly, she compared her DNA only to her mother’s, not Robert’s or her siblings — which could have proven conclusively that Robert was not her biological father.