"It's all going to come out sooner or later," Norman Pardo told In Touch magazine. "Khloe could be O.J.'s kid."
Rumors that Kardashian's mother, Kris Jenner, had an affair with the 66-year-old convicted felon have been going around for awhile and according to Pardo, "he giggles" whenever the possibility that he is Kardashian's biological father is mentioned.
According to In Touch, Jenner was friends with Simpson long before her late husband Robert Kardashian defended him in a highly publicized criminal trial for the murder of his wife.
"They all took their vacations together. There was a lot of partying going on back then," Pardo said. "Kris cheated on Robert -- she was known for having a good time."
Pardo added that Simpson will reveal more information about his relationship with the Kardashians as the 20th anniversary of his wife death approaches in 2014.