Khloe Kardashians
Back in September 2012, a picture revealed that reality star Khloe Kardashian, pictured above May 14, 2015, shared an uncanny resemblance to O.J. Simpson's daughter, Sydney. There's been a long-standing rumor that Simpson is Kardashian's true father, which means she and Sydney could possibly be sisters. Getty Images

Khloe Kardashian will never admit that anyone but the late Robert Kardashian is her father, but O.J. Simpson's daughter, Sydney, has been rumored to look like the "Keeping Up With The Kardashians" socialite. Gossip surrounding Khloe Kardashian's paternity surfaced when two of her father's ex-wives claimed that Robert Kardashian, the man who gave the reality star her famous last name, did not believe he was her biological father.

Next, the rumor that accused murderer O.J. Simpson could be her real father exploded, especially when side-by-side pictures Sydney and Kardashian were compared. The story first broke in the beginning of 2012, but began to take flight again after Simpson allegedly changed his will to include Khloe Kardashian, as a National Enquirer article reported.

"This is ridiculous and laughable," a source close to the Kardashians told the Daily Mail in January 2012. But months after the gossip over Kardashian's ancestry began, the tale is beginning to pick up speed again.

Kris Jenner, her mother, tweeted a nonchalant post about the rumor in 2012: "Thanks for all your love and support today dolls! Wow some of the stories out there today are either fabricated, or SO 24 years ago!! LOVE U."

Jenner's tweet didn't do much to squash the decades-old rumor. "O.J. told me Khloe's his child," an "insider" reportedly told the National Enquirer. "It was the big secret that no one in the two families would discuss," the source told the tabloid. "And Robert admitted he and Kris were not having sex at the time Khloe was conceived." The person added: "He [Simpson] used to tell us way back -- even before he and Nicole got divorced -- that he had a love child with the wife of a wealthy family."

At the time of Khloe Kardashian's birth, it would have been devastating to discover an American sports hero fathered a love child. "O.J.'s career as a product spokesman -- which earned him well over $10 million -- could have ended and he always worried that his children would find out some day and become very angry with him," the source said.