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Munn and her son's father, comedian John Mulaney, announced Malcolm's birth on Dec. 24.

The actress shared a snap of her sleeping newborn, which she captioned, \"My Golden Ox baby. Malcolm Hiệp Mulaney. Happy Holidays. ❤️💚\"

Mulaney shared the same photo, writing, \"Meet Malcolm Hiệp Mulaney. He has his whole life ahead of him. He hasn’t even tried seltzer yet. I’m very in love with him and his whole deal. Happy Holidays.\"

The former \"Saturday Night Live\" writer announced during an appearance on \"Late Night with Seth Meyers\" in September that he and Munn were expecting a child together.

Malcolm is the first child for both stars.

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