O.J. Simpson bragged that he had steamy sex with Kris Kardashian, his best friend’s wife, during a 1990s hot-tub tryst that ruined their marriages and friendships, claims the disgraced footballer’s former manager.

Simpson said he and his then-wife Nicole, and Robert and Kris Kardashian, were in a Jacuzzi one night while vacationing together, according to Norman Pardo in his new documentary, “Who Killed Nicole?”

Nicole and Robert turned in, leaving O.J., then 44, and Kris, then 36, alone in the bubbling water. Kris and Nicole were also good friends.

“‘O.J. said he stood up, pulled his shorts down and, I’ll give you exactly what he said: ‘Her eyes bugged out of her head and I f–ked that B until I broke her,’”

Pardo recounts on camera in a segment previewed exclusively by The Post.

“That was as messed up as you can possibly get.”

The alleged one-night stand had longstanding consequences for the four glamorous pals.

“From what I’m understanding, from what O.J. told me, everything was great up until [the] little fling that they had,” says Pardo, 55, who says he managed Simpson from 1999 to 2012 and has 70 hours of videotape of his former friend.

“The fallout from the hot-tub incident” damaged all their relationships, contended Pardo.

The Kardashians divorced shortly afterward in early 1991 and the Simpsons split by early 1992.

Pardo claims Simpson told him the alleged affair also caused Kris — now known as Kris Jenner, the 63-year-old matriarchal manager of Kim, Khloe and company — physical pain.

Simpson said “they had to take her to the hospital at 2 or 3 in the morning,” Pardo continues in the movie. “She came to [O.J.’s] room and said, ‘Can you take me to the hospital?’ He said, ‘No. Have Rob do it.’”

Simpson, now 71, boasted of the rendezvous — and the damage his menacingly large manhood had apparently inflicted — to Pardo during a 2003 limo ride from Raleigh, NC, to a paid appearance at an Atlanta nightclub, the ex-manager told The Post.
-PageSix