The Big Reunion star, 34, reveals she's made the "life-changing" decision because she doesn't want to leave her two kids without a mum.
Singer Michelle - who has Faith, two, and AJ, five months, with her husband Hugh Hanley - was diagnosed with a mutated BRCA2 gene in 2012, putting her in the high risk category for developing breast and ovarian cancer.
Two years ago, she endured a double mastectomy to reduce her chances of contracting breast cancer.
But now, in an interview with The Sun, she reveals she has made the decision to have a full hysterectomy in a bid to avoid ovarian cancer.
In the heart-wrenching interview, she says: "It's giving up everything about me, everything inside me - my breast tissue, my fallopian tubes.
"Everything that's going to go is everything that sets me apart from a man. It's a heart-breaking and life-changing decision."
She also explains that she feels differently about this major operation to how she felt about her double mastectomy.
She reveals: "A hysterectomy is not just about giving up the chance for children - it's about giving up my womanhood.
"It's only natural for women to want that third child - and that can't happen to me. So for me to make that decision five years too early, it's heart-breaking. It's really difficult."
After the interview was published in the national newspaper, Michelle's twitter was flooded with messages of support from well-wishers.
Today (12 July), Michelle tweeted: "Sometimes it doesn't hit home until I read it in black and white And then I cry, just a little, and then faith & AJ snap me back. #family."
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