Olivia Munn and John Mulaney have had their second child together

Olivia captioned a snap of her sitting on John's knee while cradling her newborn: "Méi June Mulaney came into the world September 14, 2024, the year of the dragon (dragon emoji.)

"I had so many profound emotions about not being able to carry my daughter. 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 nine months and made our dreams come true.

"I am so proud of my little plum, my little dragon for making the journey to be with us. My heart has exploded."

Olivia signed off her post by saying Méi is "pronounced May" and "means plum in Chinese".

John also announced he was a father again on his Instagram, saying in his post about the news: "Méi June Mulaney came into the world September 14, 2024, the year of the dragon (dragon emoji.)

"We stole so much stuff from the hospital. I love my little girl so much."

John also highlighted the correct pronunciation and meaning of his daughter's name.

Olivia told in April how she had suffered a "terrifying" breast cancer diagnosis a year earlier, which resulted in four surgeries, a double mastectomy and medically induced menopause.

She also had an egg retrieval procedure in June 2023 followed by breast reconstruction in September that year.