Sharon Osbourne has revealed that she underwent a double mastectomy after discovering she carried a gene that increases the risk of breast cancer. "As soon as I found out I had the breast cancer gene, I thought: ‘The odds are not in my favor’. 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," the “America’s Got Talent” judge told Hello! Magazine in an interview.