Oh Lordy, daddy's 40!
"Malcolm surprised John on stage last night to sing HBD with the whole audience," Olivia shared on her Instagram Stories on Aug. 27, along with several photos from the heartwarming moment. "And then he swiped some cake over John's shoulders."
John also shared an adorable photo of himself sitting on a stage covered in balloons and streamers while holding the 9-month-old, adding the sweet caption, "There is truly no better way to turn 40."
On his Instagram Stories, the Saturday Night Live alum shared even more snaps from the evening including a selfie with Olivia, 42, and Malcolm, writing, "Turning 40 with my little family and fist full of frosting."
The couple—whose relationship was made public in May 2021 following John's split from his wife of six years, Anna Marie Tendler—welcomed their first child together in November that year. One month later, the tot made his Instagram debut.
"Meet Malcolm Hiệp Mulaney," John wrote in a Christmas Eve post, along with the first photo of their newborn son. "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."
Since then, the stand-up star and the actress have continued to give fans glimpses into their family's world, sharing photos of and updates on their little one. Earlier this summer, John opened up about Malcolm joining him on the road for his comedy tour, saying his son is already a natural traveler.
"Malcolm is a great, great roadie," he shared on the June 22 episode of Late Night With Seth Meyers. "Malcolm loves being on tour—he loved Saratoga Springs, he loved the Westin in Buffalo—they had one of those fake fireplaces with glowing rocks, he sits down, 'This is what I'm talking about.'"