The mystery surrounding the real identity of Khloe Kardashian's biological father can be solved with a simple DNA test, and RadarOnline.com has learned there's a $250,000 offer on the table.

Sirius XM Satellite personality Gregg 'Opie' Hughes of The Opie & Anthony Show announced on Tuesday morning that he would ante up a quarter of a million dollars if Khloe, 27, would take a DNA test to prove that the late Robert Kardashian is her father.

If Khloe accepts, the $250,000 will be donated to a charity of her choice.