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Olivia Munn revealed she has been diagnosed with breast cancer.

The 43-year-old actress has been battling the disease since April 2023. Munn shared photos along with details of her ongoing fight against breast cancer on her Instagram. She explained that she received an MRI after her doctor found her Breast Cancer Risk Assessment Score to be 37%. The MRI found Luminal B cancer, "an aggressive, fast moving cancer," in both breasts.

"In February of 2023, in an effort to be proactive about my health, I took a genetic test that checks you for 90 different cancer genes," Munn wrote. "I tested negative for all, including BRCA (the most well-known breast cancer gene). My sister Sara had just tested negative as well. We called each other and high-fived over the phone. That same winter I also had a normal mammogram.

"Two months later I was diagnosed with breast cancer."

OLIVIA MUNN ON JOHN MULVANEY RELATIONSHIP CRITICISM: ‘ONLY WAY TO WIN’ IS ‘TO NOT PLAY THE GAME AT ALL’

Olivia Munn shares hospital photos

Olivia Munn revealed she's been diagnosed with breast cancer. (Instagram: Olivia Munn)

Munn revealed she's had four surgeries in the past 10 months after receiving her cancer diagnosis.

"Surprisingly, I've only cried twice," the TV personality admitted. "I guess I haven't felt like there was time to cry. My focus narrowed and I tabled any emotions that I felt would interfere with my ability to stay clearheaded."

The actress decided to keep her diagnosis private in order to "get through some of the hardest parts" before sharing with her fans.

"I've tended to let people see me when I have the energy, when I can get dressed and get out of the house, when I can take my baby boy to the park," she explained. "I've kept the diagnosis and the worry and the recovery and the pain medicine and the paper gowns private."

Munn made a public appearance alongside her partner John Mulaney at the 2024 Oscars on Sunday. She also attended the Governors Awards on Jan. 9 with the comedian.

Mulaney commented on Munn's announcement, writing: "Thank you for fighting so hard to be here for us. Malc and I adore you."

John Mulaney and Olivia Munn on Oscars red carpet

John Mulaney and Olivia Munn step out for the 2024 Oscars. (Getty Images)

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John Mallaney and Olivia Munn on the red carpet

John Mulaney and Olivia Munn attend the Jan. 9 Governor's Awards. (Getty Images)

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Mulaney and Munn were first romantically linked in September 2021 after the comedian revealed they were expecting a child together during an appearance on "Late Night with Seth Meyers."

"I got into this relationship that's been really beautiful with someone incredible who has dealt with the non-coked-up Bambi version of me and that's been very incredible," Mulaney, who has dealt with substance abuse issues, said at the time. "She's kind of held my hand through that hell and we are having a baby together."

"I was nervous when I was about to say the news. That's why I looked down and then I looked up," he added to Meyers. "I'm going to be a dad."

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John Mulaney and Annamarie Tendler

Anna Marie Tendler announced her separation from John Mulaney in May 2021. (Dan MacMedan/Getty Images)

His relationship with Munn came quickly after the end of his marriage to Anna Marie Tendler. The two announced their separation in May 2021 following his stay in rehab.

"I am heartbroken that John has decided to end our marriage," Tendler said in a statement to People magazine. "I wish him support and success as he continues his recovery."

Mulaney and Munn welcomed their first child together in November 2021.

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