Olivia Munn and John Mulaney officially have double trouble in their home … welcoming kid #2 earlier this month via surrogate — this months after she revealed she had breast cancer.

Munn shared the news to Instagram Sunday … posting several pics of herself and Mulaney with their newborn — Méi June Mulaney, a girl, born Saturday, September 14.

OM explains the two used a surrogate … adding she had very strong feelings about not carrying her own baby this time around — but, their surrogate showed her grace and helped her put her mind at ease.

Munn ends her post by sharing her daughter’s cute nickname — “Plum” — ’cause that’s what Méi means in Chinese.

John and Olivia welcomed their first kiddo — Malcolm — back in 2022 … months after Mulaney divorced his wife and finished a stint in rehab for cocaine addiction.

They lived happily together since … though back in March, Olivia revealed she’s suffering from breast cancer — which she was first diagnosed with in 2023.

She’s already undergone a double mastectomy and several other surgeries — including a hysterectomy, hence needing a surrogate to carry the child.t

Olivia and John officially tied the knot back in July, legally cementing their family … and, it looks like they’re adding to it here. Congrats you two!