AceShowbiz - Singer Michael Buble and his wife Luisana Lopilato have welcomed their third child.

The Argentinian actress shared the happy news via Instagram on Thursday, July 26, revealing the couple is now celebrating the birth of its daughter.

Alongside a sweet black-and-white photo of the newborn's hand resting on the proud mum's body, Luisana posted a gushing message in her native Spanish, which roughly translates to: "How to explain that our heart explodes with love? 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 (sic)."

"We love you to infinity and beyond," she added to her baby girl, whose name has yet to be released. "We waited for you not only to grow as a family... you gave us light, hope, you are and will be our souls' life."

Cómo explicar que nos explota el corazón de amor? Que no nos alcanzan las horas del día para contemplarla. Le agradezco a Dios por hacernos este regalo de vida y alegría! Porque mirar sus ojos es mirar el cielo mismo! Te amamos hasta el infinito y más allá. Te esperábamos no solo para crecer como familia... nos diste luz, esperanza, en fin sos y serás nuestra Vida del alma!! #regalodedios #feliz #family #ourprincess

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A post shared by Luisana Lopilato (@luisanalopilato) on Jul 26, 2018 at 10:26am PDT

The little girl's arrival gives Michael and Luisana something to smile about, just two years after their eldest child, son Noah, was diagnosed with cancer. The four-year-old boy has now recovered from the life-threatening illness after undergoing surgeries and gruelling treatments, but worried father Michael recently revealed the health ordeal was more than he could handle.

"I've been to hell," the 42 year old told Australia's Herald Sun in an emotional interview. "I don't talk about the whole story, not even to my friends because it hurts too much. It's my boy. He's a superhero, he doesn't need to relive it over and again. But I've been to hell..."

"I truly thought I'd never come back to music," continued the Haven't Met You Yet singer, who took a career break in 2016 to focus on caring for Noah. "Family is what matters. The health of my children is (priority) number one. The relationship with my family, my wife, my faith - all of it is easily number one."

Michael made a triumphant return to the London stage earlier this month at the Barclaycard presents British Summer Time Hyde Park festival.