Munn was spotted wearing a black bodycon dress that perfectly accentuated her baby bump, which was clearly visible in a photograph circling around Instagram.
Dave Chappelle and his wife Elaine also posed alongside the happy parents-to-be for the snap.
“I haven’t decided if I’ll find out yet or not...It’s a good surprise to find out,” she said. "There’s very few surprises in life."
The New Girl alum also gave an update about how she has been doing on her pregnancy journey so far, sharing that she has been “feeling really good,” and that “the outpouring of love and support has been really amazing.”
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He nervously told the crowd that the pair were “having a baby together,” and gushed about his future of becoming a dad.
The Saturday Night Live writer introduced the news by giving a timeline of his relationship with Munn, which has recently been called into question.
Mulaney told Meyers, “I went to rehab in September, I got out in October, I moved out of my home from my ex-wife...Then in the spring, I went to Los Angeles and met and started to date a wonderful woman named Olivia.”
However, some seemed to believe that the comedian’s timeline might have been altered amid his split from ex-wife Anna Marie Tendler.
“She was heartbroken how it went down, it wasn’t something she wanted, she wanted it to work out,” the source said. “I am sure this news about the pregnancy will be very difficult for her.”