The Grammy-winning singer, 46, and his Argentinian actress wife, 35, announced the birth of daughter CieloYoli Rose on Instagram, posting a photo of them holding her tiny left foot.
The couple are already parents to sons Noah, eight, and Elias, six, and daughter Vida, aged three.
Michael said on the social media site: “From love comes life, light and her… our baby CieloYoli Rose Bublé.You finally arrived to our lives with your 3.8kg!!!”
“Thanks God for this infinite blessing, we love you!! Noah, Elias, Vida and your mom and dad.”
Canadian Michael, who has just played UK gigs, first revealed the pregnancy in his video for I’ll Never Not LoveYou in February.
In it, he and Luisana recreated some of the most romantic scenes in cinematic history, including sequences from movies like the Notebook, Love Actually and Titanic.
At the end of the four-minute video, the model revealed her baby bump.
Michael joked about his family size: “I think it’s already crazy. We’re already living in crazy land, so it’s just going to get better.”
“We’re so blessed to have healthy kids and a lot of love in our house. There’s a lot of noise. I would have it no other way. We’re so lucky.”
Michael and Luisana’s oldest son Noah was diagnosed with liver cancer in 2016 but he has since fully recovered.
