John Mulaney and Olivia Munn's own little Hit-Monkey just hit a special milestone.
On March 24, the couple celebrated their son Malcolm Mulaney's 4-month birthday alongside Olivia's mother, Kim Munn. To commemorate the moment, Olivia and John posted photos of themselves with their newborn on Instagram.
"It's been 4 months since the happiest, chillest baby came into my world," The Rook star wrote in her post. "He wakes up smiling every single morning without fail, he loves bath time so much that he kicks his legs and looks around whenever he hears the sound of the tub filling up, his tiny fists are his favorite things to gum on and he squeals and follows along page by page whenever we read to him."
Along with the sweet caption, the 41-year-old actress, shared a photo of herself sitting on a bed with baby Malcolm in her lap. "Happy 4 month birthday Malcolm," she added. "I love you I love you I love you."
Meanwhile, John shared his own tender moment with his son, posting a photo of the first time he met Malcolm in the hospital. "Four months ago I met a 6 lb boy who changed my life forever," he wrote in the caption. "I love you Malcolm. You are so much heavier now."
On Instagram Story, Olivia shared another sweet moment between the father-son duo. She posted a video of John looking down at Malcolm, who was seen laying down on a couch as he waved his arms back and forth. In the clip, the 39-year-old comedian turned to his son and said, "I love you, Malcolm."
Olivia captioned the video, "Birthday fun this morning before his daddy left for Texas..."
And it looks like the birthday fun continued throughout the day! The Rook star also snapped an adorable picture of Malcolm with his grandma, with Olivia noting in the caption that he was "spending his 4 month birthday with this retired tiger mom."
See more of the new family's wholesome moments below.
Time to Celebrate
John Mulaney and Olivia Munn celebrated their son Malcolm's second birthday in November 2023.
Way to Go, Idaho
The parents took Malcolm to the Gem State in June 2023.
Little Moments
Olivia shared this photo of her family of three on Father's Day 2023.
Life's a Beach
John and Olivia hit the beach with Malcom in March 2023.
Let Them Eat Cake
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.
Making Memories
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.
Birthday Boy
"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.
Dads on Duty
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.
Olivia shared that this was what it looked like "when your friend shows up and surprises you with a blowout even though you're in your robe and not going anywhere."
She said the new 'do made her "feel a little less post partum."