The Tomb Raider star has revealed she underwent an operation to remove her ovaries and Fallopian tubes last week (ends22Mar15) after a doctor detected a potential early cancer alert during a routine test earlier this month (Mar15).

The news comes nearly two years after Jolie had a double mastectomy after discovering she was at high risk of developing cancer, which runs in her family.

And after Jolie's latest big reveal was published as part of a piece she wrote in the New York Times on Tuesday (24Mar15), Osbourne shared her support for the actress as a guest on U.S. TV show The Talk, and revealed she too has the BRCA1 gene, which puts her at a higher risk for breast and ovarian cancers.

Osbourne, whose mum Sharon battled colon cancer over a decade ago and underwent a double mastectomy in 2012, said, "I agree with this 100 per cent... I actually do have the cancer gene. My mum made all of us go and get tested after she found out she had it and got her double mastectomy.

"One day I know I will have to do it too, because if I have children, I want to be there to bring them up and support them... I have been a child of a cancer survivor, so being on that end of it as well, is really, really hard to deal with.

"I applaud Angelina... because she's bringing attention to this and now people are going out and getting tested for it."

And Osbourne also revealed that she gets a reminder of her mum's bravery with the small gold band on her right hand she wears daily.

She said, "The ring that I'm wearing is because when she was getting taken into the operation room, she was trying to hide that she was wearing her diamonds because she didn't want to take them off.

"The doctor caught her and put them on my finger and it's never come off since. It's a constant reminder that I have to check myself."