Originally appeared on E! Online .

Khloe Kardashian is well aware of the rumors about the identity of her biological father. Bible.

So, when Kim Kardashian revealed she was actually the anonymous buyer who paid over $80,000 last year to obtain a Bible dad Robert Kardashian Sr. had gifted to his longtime friend O.J. Simpson, the sisters couldn't pass up the opportunity to poke fun at the longstanding speculation surrounding Khloe's true paternity.

"What a--holes just to not just give it to us," Khloe quipped on the Nov. 20 episode of " The Kardashians ," referring to how Kim's initial proposal of $15,000 to privately purchase the book from O.J.'s estate was rejected. "It's proven he's our dad."

Kim then joked, "Well, it's questionable between which one, between O.J. and Dad.

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