"Keeping Up with the Kardashians" star Khloe Kardashian bonded with Bruce Jenner in an adrenaline-fueled activity on Monday, as the sex change rumors continue to hog the tabloids.

Also joining Khloe Kardashian and Bruce Jenner were Scott Disick, the partner of sister Khloe Kardashian.

"The 65-year-old Olympian and reality TV star spent the day with his step-daughter Khloe on Monday as they indulged in one of his favourite hobbies, dune-buggy racing," the Daily Mail said.

The sex change rumors have escalated when In Touch Weekly superimposed an image of Bruce Jenner over the face of actress Stephanie Beacham. The article was slammed by the family as ridiculous and Kris Jenner even lashed back as she allegedly banned the Kardashian-Jenner clan from interacting further with the magazine.

Kris Jenner's ex will reportedly address the issue in future episodes of "Keeping Up with the Kardashians."

Kim Kardashian, meanwhile, took to her Bruce Jenner's defense following the sex change rumors. In an interview with Entertainment Tonight, she said the whole family is behind the former Olympian.

"Well we support Bruce no matter what, so we were just at his house hanging out and we wanted to take a picture, that was not like a secret message like, 'We support Bruce.' Of course we support Bruce 100 percent," she said.

Kanye West's wife added: "He's our dad so we support him no matter what, and I think when the time is right, he'll talk about whatever he wants to talk about. I just think it's his story to talk about, not really mine."

As to the sex change rumors surrounding Bruce Jenner, Kim Kardashian said: "I think everyone goes through things in life, and I think that story and what Bruce is going through, I think he'll share whenever the time is right," she says. "I feel like that's his journey to talk about."