Demi Moore has gone public with a truly shocking and harrowing admission.

It has to do with something that happened to the actress as a teenager... her mother's role in this tragedy... and the affect it continues to have on the star.

According to Moore in her just-released memoir, "Inside Out," her very own mother orchestrated a sexual assault against Moore when the actress was 15 years old.

In this book, Moore claims that her alcoholic mother, Virginia King, began taking her to bars to get noticed by men when Moore was a young teenager.

One night, she came home to find an older man there ... in possession of a key to the apartment.

After this man had raped her, Moore alleges he said her mother had sold her to him.

In the book, she writes:

“It was rape. And a devastating betrayal, revealed by the man’s cruel question: how does it feel to be whored by your mother for $500?”

Asked if she believed the man, Moore told Diane Sawyer in an interview  this week:

“I think, in my deep heart no. I don’t think it was a straightforward transaction. But she still did give him the access, and put me in harm’s way.”

Moore's mother died in 1998.

At the age of 12, Moore writes that her mom tried to commit suicide and she was the one who saved her life.

"I remember using my fingers, the small fingers of a child, to dig the pills my mother had tried to swallow, out of her mouth,” Moore writes in the memoir, labeling this a "life-changing moment" for her.

The actress would go on to check into rehab drug and alcohol abuse in the mid 1980s, prior to making it huge in Hollywood with roles in such blockbusters as Ghost, A Few Good Men and Indecent Proposal.

She has made numerous headlines over the past several due to the many revelations in this book, such as:

- One of the reasons she split from ex-husband Ashton Kutcher is that he talked her into threesomes that she later regretted.

- She miscarried a baby girl six months into her pregnancy back when she was married to Kutcher.

- After her divorce from Kutcher, she dropped down to 102 pounds and collapsed at a party and was hospitalised after smoking synthetic cannabis and inhaling nitrous oxide at one point.

"I guess the fundamental question that came forward for me was, 'How did I get here?'" Moore shared with Sawyer, referencing the party collapse and adding:

"I mean, from where I started to what I've experienced, where I've been, how did I get here?"

Continued the actress of this time period:

"I lost me. I think the thing, if I were to look back, I would say, I blinded myself and I lost myself."

Inside Out went on sale on Tuesday, September 24.

We wish Demi Moore the best.