Kim Kardashian lost her virginity at 14… you’ll NEVER guess who with

Kim Kardashian has always been extremely open about her sex life, even telling her family that she and Kanye were getting down to it "like 500 times a day" while trying to conceive.

And now a new source has revealed something even more personal about Kim's antics between the sheets – outlining when she lost her virginity and who with.

A new book, described as the "definitive biography" of the KUWTK star, claims Kim had sex for the first time aged just 14, with a member of another celebrity dynasty.

Kim dated TJ Jackson (nephew of the late Michael Jackson) during her early teen years, and the pair began having sex quite early on.

The book, titled Kim and written by biographer Sean Smith, details Kim's two-year romance with TJ, long before she encountered her future husbands Kris Humphries and Kanye West.

Kim has opened up about losing her virginity in previous interviews, revealing she was very young when her mum Kris Jenner put her on birth control.

"When I did want to have sex for the first time I was almost 15," she told Oprah Winfrey of the conversation with her liberal mum.

"I was like, 'I think I’m going to, or I want to,' and she [Kris] was like, 'OK, so this is what we’re gonna do, we’re gonna put you on birth control,' and she was like, really open and honest with me."

While Kim has never openly stated that TJ was the one she lost her virginity to, she has spoken about dating him around that time, even revealing she spent her 14th birthday at Michael's Neverland ranch.

As for TJ – now married with three kids – he still has fond memories of his high school romance with the star.

"I still talk to the family every now and then, though not too much," he told Reveal magazine last year.

"I dated Kim when my mother passed away, so I was actually quite close to the family when I was young."