Olivia Munn Reveals Breast Cancer Diagnosis and Shares Her Prognosis: “Surprisingly, I’ve Only Cried Twice”

Munn was just on the red carpet with partner John Mulaney on Sunday.

Olivia Munn
(Image credit: Getty Images)

In an effort to help others find comfort, inspiration, and support on their respective journeys, actress Olivia Munn revealed that she has been diagnosed with breast cancer and underwent a double mastectomy, multiple outlets report.

Munn shared the news on Instagram, explaining that in February 2023, she took a genetic test that checked her for 90 different cancer genes—and tested negative for all of them, including BRCA, the most well-known breast cancer gene. This past winter, her mammogram results came back normal; two months later, she learned she had breast cancer.

“In the past 10 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,” Munn wrote. “Surprisingly, I’ve only cried twice. I guess I haven’t felt like there was time to cry. My focus narrowed and I tabled my emotions that I felt would interfere with my ability to stay clear-headed.”

Olivia Munn

When Munn appeared at the "Vanity Fair" Oscars afterparty on Sunday night, we were none the wiser as to what she'd been facing

(Image credit: Getty Images)

In the candid and vulnerable post, Munn shared that she has only let people see her when she has had the energy to get dressed and get out of the house or take her son, Malcolm, to the park. (She shares Malcolm with comedian John Mulaney.) “I’ve kept the diagnosis and the worry and the recovery and the pain medicine and the paper gowns private,” she wrote. “I needed to catch my breath and get through some of the hardest parts before sharing.”

The type of cancer she was diagnosed with is aggressive and fast-moving, and Munn revealed that 30 days after her biopsy, she had a double mastectomy. “I went from feeling completely fine one day to waking up in a hospital bed after a 10-hour surgery the next,” she continued. “I’m lucky. We caught it with enough time that I had options. I want the same for any woman who might have to face this one day.”

Olivia Munn

Munn and Mulaney attended the Academy Awards together Sunday, where he was a presenter

(Image credit: Getty Images)

Olivia Munn

It was then off to the "Vanity Fair" party, where they walked the red carpet together

(Image credit: Getty Images)

Of Mulaney, Munn wrote “I’m so thankful to John for the nights he spent researching what every operation and medication meant and what side effects and recovery I could expect,” she wrote. “For being there before I went into each surgery and being there when I woke up, always placing framed photos of our little boy Malcolm so it would be the first thing I saw when I opened my eyes.”

Munn and Mulaney were just at the Oscars together—where Mulaney was a presenter—on Sunday and attended the Vanity Fair party afterwards, as the public was none the wiser to what she was going through. 

Olivia Munn

The couple share a two-year-old son, Malcolm

(Image credit: Getty Images)

Olivia Munn

Thankfully, Munn wrote, the cancer was detected early

(Image credit: Getty Images)

In addition to the slides on Instagram sharing her health update, “Munn’s post showed pictures of her undergoing treatments and an emotional video of her crying while talking to a medical professional,” Entertainment Tonight reports. “Munn’s emotional post ended with a photo of her hospital bedside table, which had a framed picture of Mulaney and their smiling baby boy.” (The couple welcomed Malcolm in 2021.)

In addition to many celebrities sharing their support, Munn’s OB/GYN, Dr. Thaïs Aliabadi, commented on her post “You are my hero. Your post will save so many lives. I love you so much.”

Rachel Burchfield
Senior Celebrity and Royals Editor

Rachel Burchfield is a writer, editor, and podcaster whose primary interests are fashion and beauty, society and culture, and, most especially, the British Royal Family and other royal families around the world. She serves as Marie Claire’s Senior Celebrity and Royals Editor and has also contributed to publications like Allure, Cosmopolitan, Elle, Glamour, Harper’s Bazaar, InStyle, People, Vanity Fair, Vogue, and W, among others. Before taking on her current role with Marie Claire, Rachel served as its Weekend Editor and later Royals Editor. She is the cohost of Podcast Royal, a show that was named a top five royal podcast by The New York Times. A voracious reader and lover of books, Rachel also hosts I’d Rather Be Reading, which spotlights the best current nonfiction books hitting the market and interviews the authors of them. Rachel frequently appears as a media commentator, and she or her work has appeared on outlets like NBC’s Today Show, ABC’s Good Morning America, CNN, and more.