Presley Ann / Getty; Roy Rochlin / Getty Dad jokes – John Mulaney is celebrating his first Father’s Day! On Sunday, the 39-year-old comedian enjoyed a special holiday with his girlfriend Olivia Munn and their 6-month-old son Malcolm Hiệp. Munn captured the festivities with some adorable photos on Instagram with father and son on Sunday. “Happy birthday to Malcolm’s assistant,” he wrote on the couple’s Instagram Story. The baby appeared on social media wearing dark sunglasses and turquoise audio canceling headphones. The following section of the actress’s Instagram Story enlarged the face of the child that was visible on his father’s shoulder. Never miss a story – subscribe to PEOPLE’s free daily newsletter to stay up to date with the best PEOPLE has to offer, from juicy celebrity news to exciting stories of human interest. Olivia munn https://www.instagram.com/oliviamunn/ Olivia Munn / Instagram RELATED: Olivia Munn celebrates Malcolm’s 6-month-old baby baby: “You enlightened our whole world” Last month, little Malcolm turned 6 months old and received a special tribute from Munn on Instagram. Along with a smiling snapshot of mother and son relaxing on a blanket outdoors, the actress wrote: “Six months ago, today Malcolm made me his mom. 🥺🤍.” “It’s so much fun to meet him,” the 41-year-old continued. The proud mom went on to say that Malcolm “loves meeting people” and “loves his best friend Penny and believes she is hysterical.” According to Munn, her little one has also “tried peanut butter (thanks @mmcnearney + @jimmykimmel)” and “sleeps 12 hours a night (thanks @mindykaling for sharing your invaluable, reliable and tested resources).” “He wakes up from every nap with a huge smile and laughter, he LOVES when we read books to him”, continued the actress Love, Wedding, Repeat. “He screams and kicks his feet whenever his dad comes home. I can’t stress enough how much he likes the bathroom and likes to be outside and looking at the trees and the sky.” The story goes on Munn completed her sweet post, “I love you so much Malcolm Hiệp. Happy 6 months with you. You enlightened our whole world.” A confidant told PEOPLE that Newsroom’s alum and Mulaney welcomed Malcolm on November 24, 2021. The couple first introduced Malcolm to the world on Christmas Eve, with adorable photos of him in a warm blanket as he slept. “My Golden Ox baby. Malcolm Hiệp Mulaney. Happy Holidays,” Munn wrote in the caption of her post. Mulaney wrote with his own snapshot, “Meet Malcolm Hiệp Mulaney. He has his whole life ahead of him. He has not even tried Seltzer yet. I am very much in love with him and his whole deal. Happy Holidays.”