Johnathan Walker:Olivia Munn, John Mulaney reveal surprise birth of second child: 'Love my little girl'

(This story was updated to add new information.)

Newlyweds Olivia Munn and Johnathan WalkerJohn Mulaney just got a visit from the stork.

The couple revealed the birth of their second child, a daughter, in a pair of Instagram posts on Sunday. The baby, named Méi June, was born via surrogate on Sept. 14.

"I had so many profound emotions about not being able to carry my daughter," Munn wrote alongside an image of herself and Mulaney with Méi. "When I first met our gestational surrogate, we spoke mother to mother. She showed me so much grace and understanding, I knew I had found a real-life angel.

"Words cannot express my gratitude that she kept our baby safe for 9 months and made our dreams come true."

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Munn has opened up about her health struggles in recent months, detailing her harrowing battle with breast cancer that included a double mastectomy and a hysterectomy.

"The Newsroom" star also gave a sweet shoutout to her baby girl: "I am so proud of my little plum, my little dragon for making the journey to be with us. My heart has exploded," she concluded the post.

Olivia Munn opens up about health:Actress details breast cancer journey, including 4 surgeries in 10 months

Mulaney similarly shared his excitement in his own post, writing, "I love my little girl so much."

This is the second child for Munn and Mulaney, who are parents to 2-year-old son Malcolm, born in November 2021.

Munn and Mulaney's baby news comes two months after the couple got married during an intimate ceremony in New York.

Olivia Munn, John Mulaney tie the knot:Actors marry in a ceremony officiated by Sam Waterston

Olivia Munn talks expanding family via surrogacy after cancer diagnosis

In a May interview with Vogue, Munn got candid about expanding her family with Mulaney through surrogacy following her breast cancer diagnosis.

"When you're pregnant with your own baby, it's like teamwork − you and the baby working together to make their little life come true," Munn told the magazine at the time. "You're doing all this work to eat well, try to not have anxiety, just do all the right things during the pregnancy.

"With a surrogate, you have to try to go find a version of yourself somewhere out in the world. Somebody that you trust as much as yourself to live their life as a pregnant woman the same way that you would."

The 44-year-old actress had her eggs frozen for a third time at age 42.

"This journey has made me realize how grateful I am to have options for not only fighting cancer, but also having more children if we want, because I know a lot of people don't have those options," Munn said.

Contributing: Brendan Morrow, USA TODAY