View gallery Image Credit: VALERIE MACON/AFP via Getty Images Olivia Munn was diagnosed with breast cancer in 2023 and chose to keep the news private for a year. In an open letter shared on Instagram in March 2024, the former The Newsroom star detailed how her luminal B cancer was discovered and explained why she decided to keep the information private until now. Since then, Olivia has been keeping fans updated on her journey, aiming to raise awareness about the type of cancer, which is the most common form of cancer in women in the United States, excluding skin cancers.