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
Two Danish radio hosts killed a rabbit with a bicycle pump live on air in a bid to highlight the "hypocrisy" of animal welfare campaigners.
The BBC has axed Never Mind the Buzzcocks after more than two decades.
Not a bad day at all - just a little patchy rain in the far north of Scotland.