According to radaronline: Khloe is not a Kardashian! Robert Kardashian's ex-wife and widow have come forward in a Star magazine exclusive in which they both claim that the late Kardashian expressed his doubts about the paternity of Khloe. "Khloe is not his kid -- he told me that after we got married," Jan Ashley, 63, the woman who married Robert after Kris Jenner, revealed to Star. PHOTOS: Jay-Z…