Rose Byrne, Bobby Cannavale welcome baby boy

Celebrity Babies On the Way
Celebrity Babies On the Way

Congrats are in order for Rose Byrne and Bobby Cannavale -- the couple have welcomed a baby!

Cannavale, 45, unveiled the news on Friday evening while appearing on The Late Show with Stephen Colbert.

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"I had a baby on Monday, yes," the Vinyl actor said during the show. "You know, I didn't do anything."

He continued, joking, "We [men] don't do anything and I'm so tired. I think I've gained 28 pounds since Monday. I mean, I'm not kidding you. Like, this jacket fit so well, like, last Thursday. But I've been eating so much."

Cannavale also revealed that his baby boy with Byrne, 36, is named Rocco and he "is doing well."

The couple, who have stayed pretty mum about their relationship, started dating in 2012 and have starred together in 2014's Annie and Adult Beginners.

See photos of Robse Byrne and Bobby Cannavale together: