Rose Byrne and Bobby Cannavale are officially parents! Cannavale confirmed the news Friday during his appearance on Late Show with Stephen Colbert, saying Byrne gave birth to a baby boy on Feb. 1

"You know, I didn't do anything ... and I'm so tired," the Vinyl star said. "I think I've gained 28 pounds since Monday."

The couple named their baby Rocco after the patron saint of the sick, or "patron saint of made guys," as Cannavale joked.

Vinyl: Martin Scorsese and Mick Jagger define '70s New York rock scene

Cannavale and Byrne started dating in 2012 and have since made three movies together: Annie (2014), Adult Beginners (2014) and Spy (2015).

The 45-year old actor also revealed that his idol-turned-card-playing-buddy Al Pacino sent the couple a diaper cake to celebrate Rocco's arrival.

"It was so sweet. It was a big cake made out of diapers," Cannavale explained. "For your boy," he added in a Pacino voice.

(Full Disclosure: is owned by CBS)

WATCH: Bobby Cannavale talks working with Martin Scorsese on Vinyl