Speak your truth, Brit.

The former couple dated from 1999 until 2002, with many speculating that Timberlake's song, Cry Me A River, was about an infidelity on Spears' part.

The Woman In Me is due to hit shelves next week on Tuesday, October 24th and it is expected to be a 'a brave and astonishingly moving story about freedom, fame, motherhood, survival, faith and hope', according to Gallery Print publishers.

It is anticipated that the memoir will delve into the relationship between the Toxic singer and the *N-SYNC member, with TMZ reporting that Spears does not name the woman Timberlake was allegedly unfaithful to her with.

This is because the woman 'now has a family [Spears] doesn’t want to embarrass'.

PEOPLE have published excerpts from the upcoming memoir which also indicate that the book will detail events from 2007, when the Crossroads star publicly shaved her head, as well as allegations that her father, Jamie Spears, fat-shamed her.

In addition, Britney also bravely revealed that she fell pregnant with Timberlake's child in late 2000 and that 'he wasn't happy about' it.

She ultimately decided to have an abortion as she claimed her former partner 'didn't want to be a father'.

Britney Spears reveals she was pregnant with Justin Timberlake’s child

"I agreed not to have the baby. I don’t know if that was the right decision. If it had been left up to me alone, I never would have done it," she writes.

Britney, who now shares two sons with her ex-husband, Kevin Federline, described the termination of her pregnancy as 'one of the most agonizing' experiences of her life.

The source told Page Six that the upcoming release date for the memoir is 'eating at' the Mirror singer as he is 'concerned' about it and 'very curious' to find out what 'she'll reveal' about their relationship.

The Woman in Me has since shot to the No.1 spot on Amazon's bestsellers list ahead of its release.

READ MORE:

• Britney Spears reveals she was pregnant with Justin Timberlake’s child
• Justin Timberlake’s family in ‘chaos’ ahead of Britney’s explosive memoir
• Britney Spears shares the real reason she shaved all her hair off in 2007
• Britney Spears has reportedly moved on from husband Sam Asghari