Rose Byrne and long-time boyfriend Bobby welcome baby boy

Neighbours actress Rose Byrne has given birth to a baby boy. 

Her longtime boyfriend Bobby Cannavale made the major announcement on Friday night when appearing on The Late Show with Stephen Colbert. 

His leading lady welcomed a baby boy with him earlier this week.

"I had a baby on Monday, yes," the actor said on the show. 

"You know, I didn't do anything. We [men] don't do anything and I'm so tired. I think I've gained 28 pounds since Monday."

He later admitted that his baby's name is Rocco and he "is doing great."