Kim Kardashian has always been open about her youthful sexual experiences. The reality star opened up to Oprah Winfrey in 2012 that she lost her virginity when she was 14.

While Kim kept a tight lip on who she lost her v-card to, Sean Smith, the author of an e-book titled Kim, based on the reality star’s life, claims the 34-year-old had sex for the very first time with Michael Jackson's nephew, TJ Jackson.

The book details her young romance with the star throughout her high school years before she was to cross paths with RJ, Reggie Bush, Kris Humphries and her now husband Kanye West.

Back in 2012 Kim surprised many when she told Oprah Winfrey about her mother's role in her first sexual experience.

Kim talked about wanting to have sex the first time she was almost 15 with her boyfriend of two years. The 34-year-old told Oprah, “I was like, ‘I think I’m going to, or I want to,’ and she [Kris Jenner] 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.”

Speaking about Kim last year, TJ told Reveal magazine: "I still talk the family every now and then, though not too much because our schedules are pretty busy. I dated Kim when my mother passed away, so I was actually quite close to the family when I was young."

TJ’s mom passed away in 1994, making Kim 14 at that time.

Sean Smith isn’t the first person to name TJ as Kim’s first lover. Pam Behan, a nanny who worked for the Kardashians from 1991 to 1996, wrote in her tell-all book titled Malibu Nanny: The True Adventures of the Former Kardashian Nanny that TJ was Kim’s boyfriend during her teenage years.

TJ Jackson went on to become one third of the boyband 3T and is now married with three children.

Meanwhile, Kim is of course married to rapper Kanye West and she is pregnant with their second child, due in December.