"Overjoyed and filled with gratitude at the arrival of our son," the new dad writes.
After announcing he and the Argentine actress were expecting their first child, the dad-to-be couldn't contain his excitement over pending parenthood.
"I had just found out [we were expecting]. It was the greatest day of my life, so I just said, 'You know, I'm having a baby!'" Bublé shared when explaining why he first broke the baby news to Reese Witherspoon.
In March, the couple discovered they would welcome a son. "We have just come from the hospital and the sonogram was pretty clear — it's a boy! We are thrilled," Bublé said at the time.
Finding out the sex of their baby boy coincided with the selection of the new pope, who happened to be from Lopilato's native country. "She said, 'It's a sign!' But there is no way we are going to call him Frank, even if it did work well for Frank Sinatra," the singer joked.
Image: Michael Bublé and Luisana Lopilato, via Helga Esteb / Shutterstock