The little cutie celebrated the milestone with chocolate cake.
Munn surprised Mulaney on the road by bringing their son on-stage at his Nashville show Friday.
Baby Malcolm celebrated nine months with an adorably oversized cowboy hat photo shoot.
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The comedian drew reave reviews from fans and even the home team's announcers.
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Mulaney, who welcomed the baby with girlfriend Olivia Munn, also revealed the places Malcolm has liked best so far.
Munn took to Instagram Tuesday to celebrate 6 months of being a mom.
The actress revealed this is the first time she's been harmed physically, although racial slurs have been directed at her in the past.
The 41-year-old actress talked about suffering from postpartum anxiety.
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The actress is mom to 2-month-old son Malcolm, whom she shares with John Mulaney.
Olivia Munn and John Mulaney welcomed their son in November.
The 'Saturday Night Live' star also cracked a joke that had the new parents laughing.
