Olivia Munn has revealed she was diagnosed with breast cancer and had a double mastectomy. The actress shared the health update in an Instagram post, where she explained that this past winter, she had a normal mammogram, and then two months later, she found out she had breast cancer. She wrote, "In the past ten months I have had four surgeries, so many days spent in bed I can't even count and have learned more about cancer, cancer treatment and hormones than I ever could have imagined."