After Olivia Munn was diagnosed with breast cancer in 2023, she urged her mom and sister to take a risk assessment test.

Olivia Munn is opening up about her mom's breast cancer diagnosis. The "Your Friends and Neighbors" star, 45, took to Instagram on Wednesday and revealed that her mom was diagnosed with Stage 1 HER2 breast cancer after Munn's own breast cancer diagnosis in 2023.

Olivia Munn has for more than a year been speaking out about the importance of a breast cancer risk assessment test that helped lead to her diagnosis in 2023, and she has now shared that that very same test also led to her mother’s breast cancer diagnosis.