Although Cannavale has shared photos of Rocco on social media before, this is the first full photo of his son's face.
Speaking to Stephen Colbert on the Late Late Show, Byrne topened up about motherhood.
"It takes a long time to leave the house, maybe an hour, hour and 45 minutes just to get out the door," she said.
"To do anything, you have to bring so many things with you: the bottle, the sling, this and that. Then when you get out, then he just throws up everywhere or takes a big poop, and you've got to go back inside again."
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