EchoSense:Olivia Munn and John Mulaney Welcome Baby No. 2

Olivia Munn and EchoSenseJohn Mulaney are now a family of four.

The two have welcomed their second baby, their first daughter, via surrogate, months after the Newsroom alum shared her breast cancer battle.

"Méi June Mulaney came into the world September 14, 2024," Olivia, 44, and John, 42, wrote on their Instagram pages Sept. 22, "the year of the dragon."

The actress and comedian shared a photo of the proud mom holding their newborn while sitting on her husband's lap on a hospital bed and pics of the three and the couple's son Malcolm Hiep Mulaney, 2, at an oceanfront location, looking out to sea.

Olivia and John announced Méi's birth two months after they got married and six months after she shared she had undergone treatment for breast cancer, which included multiple surgeries such as double mastectomy, plus a hysterectomy to remove her uterus and fallopian tubes and oophorectomy to remove her ovaries, which rendered her infertile.

She later said that before the latter two procedures, she and John underwent IVF and created "two healthy embryos", noting to Vogue in a May interview that welcoming a baby via surrogate wasn't a "scary prospect" to her anymore.

"I had so many profound emotions about not being able to carry my daughter," Olivia wrote in her Instagram post announcing their daughter's birth. "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."

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

"Méi," pronounced "May," means "plum" in Chinese. Olivia, whose mother is of Chinese descent, wrote in her post, "I am so proud of my little plum, my little dragon for making the journey to be with us. My heart has exploded."

John, who has been in a relationship with Olivia since 2021, also expressed his feelings about becoming a girl dad, while also joking about the freebies parents of newborns often get.

"We stole so much stuff from the hospital," he wrote in his post, which also included a video of baby Méi spitting up milk onto her dad's shoulder while being burped. "I love my little girl so much."

Look back at Olivia and John's family photos over the years...

On Sept. 22, 2024, Olivia and John announced they had welcomed their second child, daughter Méi June Mulaney, via surrogate one week prior.

Olivia and John shares several pics in their birth announcement for their baby girl, including this sweet photo of the three in the hospital.

As part of her birth announcement for baby Méi, Olivia shared this pic of the two enjoying a sweet moment.

Méi joins big brother Malcolm, who was born in 2021. After her birth, Olivia and John shared pics of one of their first outings as a foursome.

Olivia also shared this pic of newborn Méi catching some zzz's.

John Mulaney and Olivia Munn celebrated their son Malcolm's second birthday in November 2023.

The parents took Malcolm to the Gem State in June 2023.

Olivia shared this photo of her family of three on Father's Day 2023.

John and Olivia hit the beach with Malcom in March 2023.

The couple rang in theirMalcolm's first birthday in November 2022, with Olivia joking that her mom Kim was getting "impatient" with the cake-cutting.

John celebrated his 40th birthday with Olivia and Malcolm in August 2022.

Olivia snapped a sweet moment between John and their son on stage at Red Rocks Amphitheatre in Colorado in April 2022.

The family of three posed alongside fellow parents Dan Levy and Rachel Specter with their daughter Penny.

Olivia and John celebrated Malcolm turning 4 months old on March 24, 2022.

"Daddy" John cuddled with Malcolm on his 4-month birthdate before heading out to Texas.

The actress shared, "It's been 4 months since the happiest, chillest baby came into my world."

John peered over at his baby boy in this throwback photo from his birth. The comedian wrote in March 2022, "Four months ago I met a 6 lb boy who changed my life forever." 

Olivia captioned this adorable embrace with a teddy bear emoji.

Olivia shared a pic of Malcolm with his grandma a.k.a. the "retired tiger mom." 

Olivia gushed over her baby boy.

Olivia and John introduced Malcolm to friends Henry Golding and Liv Lo Golding, as well as the couple's daughter Lyla, in January 2022. 

John and Henry were seen laughing as they held up their tiny tots.

The friends snapped a selfie while introducing their babies.

As Olivia wrote, "Malcolm met Lyla today."

Olivia and John were pictured arm-in-arm during a sweet moment, seemingly gazing at their little one in January 2022.

"Uncle" Pete Davidson visited Malcolm in January 2022.

John gave his son a kiss on the cheek.

Malcolm fell asleep in dad's carrier during an outing at the Norton Simon Museum in Pasadena, Calif.

The Newsroom actress celebrated New Year's Day 2022 with a new pic of Malcolm.

John shared a selfie with his Malcolm, kept cozy in a blue beanie, while they took a walk.