Olivia Munn & Baby Malcolm Surprise John Mulaney Onstage With Birthday Cake As Comedian Turns 40

John Mulaney got the sweetest 40th birthday surprise from Olivia Munn and their son Malcolm! The comedian turned 40 on Friday and performed a stand-up show at Nashville’s Ryman Auditorium on his milestone birthday. While he was onstage, Olivia orchestrated a mid-show celebration. She shared an Instagram Stories photo of her walking onstage with Malcolm and a birthday balloon, while a cake was wheeled out – and by the look on John’s face, it was a total shock!