While David is yet to share the message with his followers, he hilariously commented on his wife's post, writing: "Wait.... WHAT?!"
The couple, who also share a three-year-old son named Enzo, met on the set of the soap opera, "One Life to Live" which they both starred on in the early 2000s. They eventually tied the knot in December 2017.
Interestingly, Melissa's baby announcement comes exactly four years to the day since she revealed her first pregnancy. Last time she was expecting, the show's writers worked her baby bump into the plot, having her character go undercover at a women's prison as a pregnant inmate.
After changing the script, Melissa chatted to Entertainment Tonight about how the timing of her pregnancy lined up perfectly with her shooting schedule.
"So we got a surprise pregnancy that weirdly timed out brilliantly where my due date was two weeks after we're supposed to wrap Brooklyn Nine-Nine," she said. "So we felt like, 'OK this is meant to be. This feels very serendipitous.' We were, after we got over our initial shock, we were very, very excited."