Cannavale announced his son's arrival during an appearance on "The Late Show with Stephen Colbert" on Friday while promoting his new HBO series "Vinyl." “I had a baby on Monday, yes,” the 45-year-old actor revealed. Bobby and Jake played father and son on screen during the fourth season of "Nurse Jackie." Byrne and Bobby Cannavale started dating back in 2012 and have gone on to co-star in films with varying degrees of success like "Annie" (horrible), "Adult Beginners" (better) and "Spy" (best).

Rose Byrne and longtime boyfriend Bobby Cannavale welcomed their baby to the world, and only told us about it almost a week later.

In this day and age when one of the first thoughts after a proposal/birth/any other life major announcement is ‘Which photo am I going to use on social media and how am I going to caption it? I think I've gained 28 pounds [nearly 13 kg] since Monday. Like, this jacket fit so well, like, last Thursday.

"[It] is a very intense thing you can experience together ...

It's not for everybody, but I think he's such a great actor." We wish them the best of luck on and off screen.

Acting alongside your significant other isn't always the recipe for success in Hollywood (see "Gigli," "The Amazing Spider-Man 2," "Daredevil," etc.), but it seems to be working all right for these two.

"It's so much fun," Byrne told People magazine about sharing the screen with Cannavale.

Degrassi: The Next Generation is a Canadian teen drama television series created by Linda Schuyler and Yan Moore.

The series is now considered the first incarnation and premiered on CTV on October 14, 2001 and then ended on MTV Canada and Teen Nick on August 2, 2015.

Three weeks after Bobby Cannavale and his longtime girlfriend, Rose Byrne, welcomed their first child, a baby boy named Rocco, the actor has opened up about his newborn son — and confessed the couple is in total "bliss" with their new addition!