Khloe Kardashian
Kim Kardashian’s younger sister Khloe made some candid revelations about Kim’s estranged husband Kris Humphries, marriage and paternity at The Tonight Show, Wednesday. Khloe Kardashian

Earlier this week, O.J. Simpson dropped a bombshell when The National Enquirer reported that he had changed the terms of his will to include Khloe Kardashian, the daughter of late attorney Robert Kardashian, whom the former NFL star allegedly believes is his biological daughter. But the Kardashian family, who has fought off rumors about Khloe's parentage for years, won't budge, calling the claims fabricated.

Kardashian, who is currently being considered to host "The X Factor USA," according to US Magazine, has previously joked about the fact that she doesn't look quite like the rest of her siblings but has slammed rumors that O.J. Simpson is her biological father.

For years, the youngest Kardashian sister has faced much public scrutiny over the fact that her 3 other siblings from her mother's marriage to Robert Kardashian (including brother Robert Jr., and sisters Kim and Kourtney) all share noticeably similar coloring and face shapes, unlike Khloe, who is considerably taller and has a fairer complexion.

In an April 2009 episode of "Keeping Up With The Kardashians" her mother, Kris Jenner, even urges Khloe to take a DNA test, supposedly to give her some peace of mind, but Khloe ultimately refuses, saying, "Seriously, my dad is Robert Kardashian. My other dad is Bruce Jenner. If you f---ed other people during the same time and you do not know, go on 'Maury'!"

But while Jenner has yet to appear on "Maury," she did admit in her memoir "Kris Jenner... and All Things Kardashian," that she had an affair with a younger man during her marriage to Robert Kardashian.

"His name was Ryan and he was a producer. We had wild sex everywhere, all the time," Jenner revealed in her memoir, adding. "One morning, Robert had me followed. He found us at a restaurant."

The couple divorced shortly afterward, but Jenner refers to the affair as a huge mistake, and has expressed remorse on "Keeping Up With the Kardashians" the irreparable hurt she believes she caused him.

"When you're very young you do a lot of stupid things," Jenner wrote in her book, describing the period during her affair as "a mid-life crisis". "It's probably the biggest regret of my life that I ended up having an affair. [I was] probably just really naive and stupid and restless and didn't realize that marriage has its ups and downs."

However, Jenner has never admitted to a relationship with Simpson, and provided testimony against him to the prosecution team in the 1994 murder trial of Simpson's ex-wife, Nicole Brown. Robert Kardashian met Simpson when they attended college together at USC , and the two couples became close friends. But Kardashian served on Simpson's defense team during the trial, causing conflict between him and Jenner.

Although Khloe has not openly addressed the rumors that O.J. Simpson could be her real father, she did expressed her ire about the gossip back in January, when two of Robert Kardashian's exes, Jan Ashley and Ellen Pierson, came forward to reveal that Robert allegedly knew Khloe was not his biological daughter.

Jan Ashley, who married Kardashian after his divorce to Jenner, told Star Magazine, "Khloe is not his kid - he told me that after we got married. He just kind of looked at me and said [it] like it was a matter of fact. He said, 'Well, you know Khloe's not really a Kardashian, don't you?'" reported the Daily Mail, in January of 2012.

Khloe responded on Twitter, saying, "The audacity you have to mention my father's name like this! [You] should be ashamed of yourself! I let a lot of things slide, but this one is really low ... YOU ARE DISGUSTING!"