It's a boy!

Michael Buble and Argentine model/actress Luisana Lopilato welcomed a son, Noah, this morning -- and the proud parents have already shared a photo of their little guy on Instagram.

"Overjoyed and filled with gratitude at the arrival of our son Noah Bublè," Michael posted about the couple's new arrival. "Born this morning, August 27th at 2:26 am in Vancouver, Canada."

The photo shows the couple still in the hospital, with Noah fast asleep on his mama's chest.

And how gorgeous does Luisana look for someone who just gave birth? Love the pink nails too ... hope she wasn't expecting a girl!

This is the first child for the couple, who tied the knot in 2011.

Congratulations! See more personal pics of stars and their kids in the gallery above.