Kim Kardashian has seemingly confirmed widespread speculation that her stepfather Bruce Jenner is transitioning into a woman after revealing that he is on a "journey" on US television.

Appearing on Entertainment Tonight to celebrate the upcoming debut of her T-Mobile Super Bowl advert, the 34-year-old reality star alluded that there was some truth to the rumours by refusing to deny the claims. Kanye West's wife instead acknowledged that Jenner has a "story" to tell.

"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 said. "I feel like that's his journey to talk about."

The mother-of-one went on to say that she and her sister support the former athlete in his life choices.

"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," she said before adding: "I just think it's his story to talk about, not really mine."

Jenner has been the focus of sex-change speculation after he reportedly had his Adam's apple surgically reduced, a common procedure often undertaken by men seeking gender reassignment. The 65-year-old reality star also allegedly started taking oestrogen and asked to be referred to as "Brigitte".

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While Kardashian may have been willing to discuss the rumours, her mother Kris Jenner has shut down claims that her ex-husband is seeking gender reassignment as completely false and unfounded.

"Ninety-nine percent of the stuff in the tabloids is made up," she previously told Entertainment Tonight.

Earlier in January, InTouch magazine came under fire after it featured a doctored photo of Jenner wearing lipstick, curled hair and a woman's green silk scarf on the cover, with the headline "My Life As A Woman".

It was just one of the media outlets Russell Brand accused of "bullying" Jenner, claiming that transphobia is the new homophobia.

The 39-year-old British comedian slammed widespread reports as "cruel" and "judgmental", during an episode of his YouTube show Trews - which stands for True News.

"This is bullying. Stop. Stop. Bruce Jenner is a human being," Brand said. 'If you want to learn more about transgender issues, look at"

But despite the public scrutiny, Kardashian said Jenner is the "happiest" she's ever seen him.