In an interview with Hello! magazine, Osbourne, 60, said:
As soon as I found out I had the breast cancer gene, I thought: 'The odds are not in my favour'.
I've had cancer before and I didn't want to live under that cloud: I decided to just take everything off, and had a double mastectomy.
More top news
The tech giant is taking steps to measure economic confidence and steps to halt the spread of fake news, but denied that it was a publisher.
Temperatures still a talking point
Tom Mauser's son Daniel was killed during the Columbine high school massacre. He writes for ITV News about incoming President Trump.