Kim Kardashian covers Rolling Stone in nautical shoot as she reveals she found out Caitlyn Jenner's 'secret' age 22

Kim Kardashian has unveiled her brand new cover for Rolling Stone magazine, posing in a nautical themed shoot.

The KUWTK star, who posted the picture on her Twitter account on Wednesday, talks to the magazine about the moment she caught stepfather Caitlyn Jenner cross-dressing for the first time when she was 22.

A teaser for the in-depth article includes Kardashian admitting to being worried that Jenner would 'come after her' after she begged her not to tell anyone what she had seen.

The pregnant star told the mag: "I was shaking. I didn't know if I'd just found out his deepest, darkest secret, and he was going to come after me."

She recalls how Jenner then called her to say: "One day, I'll talk to you about this. Until then, don't tell a soul."

Kardashian revealed that she was nervous about Jenner walking her down the aisle when she married Kanye West as she didn't know if she'd be confident doing it as a man.

She said: "I wasn't sure if Bruce was going to be comfortable walking me down the aisle.

"He had just had his trachea shaved, so I knew something was going on."

The reality star discussed Jenner's gender transition earlier this week at the Commonwealth Club of California, saying:

"The response has been overwhelmingly so positive. I hope people understand it, or have compassion. I hope people are non-judgemental."