During a Friday appearance on The Late Show with Stephen Colbert, the actor revealed that he and Byrne had welcomed a son, Rocco, on Monday, Feb. 1.
The actor also joked that he had gained “28 pounds” and that he is “doing well.”
Cannavale and Byrne, 36, revealed the pregnancy in the fall, three years after they began dating. (The actor is also the father of a 20-year-old son — “nice grouping,” Colbert joked.)
Byrne told PEOPLE last year of their relationship, “Bobby’s a great cook. He’s Cuban and he does a couple of really good Cuban dishes like arroz con pollo and Cuban cocktails. He’s better than I am. I’m the good cleaner after!”
And of their sometimes overlapping careers, having now co-starred in Spy, Annie and Adult Beginners?
It “is a very intense thing you can experience together,” Byrne told PEOPLE. “It’s not for everybody, but I think he’s such a great actor.”
— Adam Carlson