February 06, 2016 12:05 PM

It’s a boy for Bobby Cannavale and Rose Byrne!

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 had fun describing the diaper cake gifted to him by friend Al Pacino. ” ‘For your boy!’ ” Cannavale, 45, told Colbert, imitating Pacino as he handed over the present.

Neilson Barnard/Getty

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 SpyAnnie 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

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