John Mulaney and Olivia Munn are expecting first baby together

Comedian John Mulaney and actress Olivia Munn are expecting a baby. Mulaney, 39, announced the news Tuesday on "Late Night with Seth Meyers."

"We're having a baby together," Mulaney said. "I was nervous when I was about to say the news! I'm going to be a dad. We're both really, really happy." Mulaney, who has always been open about his struggle with addiction, discussed his recent stint in rehab and divorce from his ex-wife, Anna Marie Tendler.