Brooke Shields underwent labia surgery. Then her male doctor did something without her consent.

Brooke Shields has admitted to a deeply disturbing experience she had with a surgeon going rogue without her consent.

In her upcoming memoir Brooke Shields Is Not Allowed to Get Old: Thoughts on Aging as a Woman, the 59-year-old shared a medical experience involving an unauthorised surgical procedure.

Initially, Shields consulted her gynaecologist about ongoing discomfort, including bleeding and chafing she had experienced since her teenage years. In response, her doctor recommended labia reduction surgery to address these medical issues.

The procedure wasn't covered by insurance as it was considered cosmetic, but Shields decided to proceed with the surgery for health reasons.

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She opened up to Us Weekly about the experience. "Of course, it's not covered by insurance because it's considered cosmetic, which is very interesting," Shields said, raising concern over why it was classified this way when the issue had nothing to do with aesthetics.

"The last time I did check, I did not want to be a porn star," she said.

After the surgery, during a post-operative checkup, her male surgeon revealed he had performed an additional procedure without her knowledge or consent.

He "legitimately proudly" informed her that he had "thrown in a little bonus" or "a little twofer", he boasted, which was a vaginal rejuvenation procedure that tightens the vagina.

Shields was left "dumbfounded" by this revelation and described the surgeon's actions without her consent as "such an invasion, such a bizarre, like, rape of some kind".

The experience left Shields dealing with feelings of shame and anger, and she initially found it difficult to discuss the incident, even with her husband, Chris Henchy.

Brooke Shields and Chris Henchy have been married for over 23 years. Image: Getty.

The actress emphasised she had never expressed an interest in the additional 'irreversible' procedure. "Nothing pointed toward this need to be tighter or smaller or firmer or younger, especially there," she recalled.

Both Shields and her gynaecologist were outraged by the surgeon's actions.

While she chose not to pursue legal action against the surgeon, she decided to share her story to raise awareness about some ethically dubious practices around women's health.

Since having the surgery, Shields admits that she "definitely noticed a difference in my body, and not a good one."

The decision to include this experience in her memoir is not one Shields made lightly.

"I'd be lying if I said I'm not embarrassed to share this very intimate information," she wrote.

"But, if we are to change the way we approach and talk about women's health, then we need to bring up the uncomfortable but very real issues. Shame is no longer an option."

Brooke Shields speaks during the Fortune Most Powerful Women's Breakfast on ageing and longevity. Image: Getty.

This isn't the first time that Shields has spoken out about past abuse.

In her 20s, Shields was sexually assaulted by a powerful Hollywood executive after a dinner meeting about a potential movie role. After the executive invited her to his hotel room to call a cab, he attacked her.

During the assault, she froze and disassociated, a coping mechanism she had developed over years of being in the industry.

At age 10, Shields was photographed nude in a bathtub for a Playboy subsidiary magazine called Sugar n Spice.

When she was 17, she attempted to sue photographer, Garry Gross, to block further sales of these photos, but lost the case due to a contract her mother had previously signed.

Brooke Shields' new book, which discusses the cultural pressures around ageing as a woman, will be released on January 14.

Feature image: Getty.