Michael Bublé and wife Luisana Lopilato have welcomed their baby girl to the world.

The Canadian singer and Argentine actress shared their happy news on Instagram on Thursday with a black-and-white photo of their daughter's hand.

"How to explain that our heart explodes with love?" wrote Lopilato in Spanish. 

"That there's not enough hours in a day to think about it. 

"I thank God for making us this gift of life and happiness! Because looking in her eyes is looking at Heaven itself!"

"We love you to infinity and beyond," she continued. "We waited for you not only to grow as a family … you gave us light, hope, you are and will be our souls' life."

The couple are already parents to sons Noah, aged five; and Elias, aged two. 

Watch our interview with Michael Bublé on the eve of his Croke Park show earlier this month: