John Mulaney plays with his baby boy as he and

John Mulaney plays with his baby boy as he and Olivia Munn celebrate his four month birthday

‘I love you Malcolm’: John Mulaney dotes on his baby boy as he and girlfriend Olivia Munn celebrate his four-month birthday in sweet snaps

Olivia Munn celebrated her son Malcolm’s four-month birthday by posting a slew of adorable content from the boy on Thursday.

In a video posted to her Instagram Stories, her boyfriend, John Mulaney, gushed over the infant as he lay on the couch in a whale-print one-piece suit.

“I love you, Malcolm,” 39-year-old John said adorably to his son as he hugged him.

I Love You Malcolm: Olivia Munn celebrated her son Malcolm's four-month birthday by posting a slew of adorable content from the boy on Thursday

I Love You Malcolm: Olivia Munn celebrated her son Malcolm’s four-month birthday by posting a slew of adorable content from the boy on Thursday

The comedian held his tiny hands and gazed lovingly at the child.

“Birthday fun this morning before his daddy leaves for Texas,” Olivia, 41, wrote in the video, which referenced John’s upcoming tour stops in Austin.

The former Attack Of The Show host also posted a heartbreaking photo of her holding her baby boy.

She captioned it with a special message, which gushed over his “cheerfulness” and cheerful demeanor, from his smile to his love of story time.

This is his boy!  Mulaney held his son's hands as it poured over him

This is his boy! Mulaney held his son’s hands as it poured over him

So cute!  The youngster enjoyed some quality time with his dad before the comedian left town on tour

So cute! The youngster enjoyed some quality time with his dad before the comedian left town on tour

“It’s been 4 months since the happiest, most relaxed baby came into my world,” Olivia began in the post. “He wakes up every morning with a smile, he loves his bath so much he kicks his legs and looks around when he hears the sound of the tub filling, his little fists are his favorite things to chew gum on and he squeaks and follows Page after page whenever we read to him.

“I, on the other hand, change the same three t-shirts and sweatshirts,” she added. ‘Happy 4 month birthday Malcolm. I love you, I love you, I love you.’

The beauty even shared a photo of her mother cuddling with her grandson. “He’s spending his 4 month birthday with this retired tiger mom,” she posted in the photo.

'I love you': Munn gushed about her son's 'cheerfulness' and cheerful demeanor in a photo posted to her account on Thursday

‘I love you’: Munn gushed about her son’s ‘cheerfulness’ and cheerful demeanor in a photo posted to her account on Thursday

family time!  Olivia's mother also enjoyed some quality time with her grandson

family time! Olivia’s mother also enjoyed some quality time with her grandson

Munn and Mulaney welcomed their son on November 24.

The comedian opened up about becoming a parent while appearing on Saturday Night Live last month.

“Since I last hosted different things have happened – life is much better and happier now – I have a 12-week-old son,” he said. “I’m very excited, he’s a pretty cool guy for someone who can’t vote. His legs are like little calzones and I want to eat him.’

Mulaney filed for divorce from his wife of seven years, Anna Marie Tendler, 36, last July, and the split was finalized in January.

In September, he opened up about his relationship with Munn on Late Night with Seth Meyers.

“I got into this really beautiful relationship with someone incredible,” Mulaney said. “And we’re going to have a baby together. I was nervous about breaking the news!’

Proud parents: Munn and Mulaney welcomed their son on November 24;  Image February 2022

Proud parents: Munn and Mulaney welcomed their son on November 24; Image February 2022