Bobby Cannavale and Rose Byrne Welcome Son Rocco

02/06/2016 at 12:05 PM ET

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.

Bobby Cannavale and Rose Byrne
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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Showing 11 comments

Mrs. B on

What’s the big deal about him revealing the gender of his baby? It’s either going to be a boy or girl. This is not a big mystery.

LYN on

Anybody notice HE said he’s Italian American yet his girlfriend, mother of his unborn child said he’s Cuban. UH….

t-rex on

@LYN, I found that strange too so I looked it up. His mother is Cuban and his father is of Italian descent.

Jane on

Um, did you watch the whole interview?? He talked about the baby having just been born, his name is Rocco, and he hasn’t slept for four days!!! So yeah, he did a little more than reveal the gender!!!!

SMH on

This is the most irresponsible piece of “journalism” I have ever seen! Watch the interview before you report such a story! If you had seen the beginning, you would know that the baby was just born and his name is Rocco.

Carly Fontinella on

Nobody really cares about the gender of your baby! Celebs like them are so egotistical! Some folks don’t even know who you are! Ughhh!

feh on

is it impossible for you guys to get the spelling right in your headline?

it’s canavale, not canavlae.

spellcheck adds 30 seconds to the editing process.

@Lyn on

He has 2 parents, hence, the possibility for 2 ethnic heritages. It’s not that unusual!

Lol on

What a strange article. Did he let it slip?? Yes, I’d say that discussing on a talk show is letting it slip! Lol.

Stacy on

welcome baby. wishing you a long, healthy, happy and fulfilled life

Jo55 on

@feh – what editing process? This is People Ragazine. Just another day in the life…..