Michael Buble was once a party animal

Michael is quoted by The Sun newspaper's Bizarre column as saying: "The guy in the suit was a creation of a record company. That thing your grandma loves - that isn't me. It never was.

"They're marketing me as, 'Your mum will love him. The more cats you have, the more adorable this guy will be.'"

The 49-year-old singer continued: "As I look back now, I was just so immature, just so emotionally immature. I was like a kid in a candy store with fame. Like, 'Oh my God, there's all this stuff and you can buy the things you want.' I could party too."

Michael is grateful to Luisana Lopilato, his wife of 13 years, for helping him become a "better man".

He explained: "From the moment I met my wife, I became a better man.

"I was just a little lost and had no willpower when it came to control of whatever it was, partying, eating or doing whatever.

"She would say to me, 'I love you Mike, but I don't want to be with a drinking man or a drug man or a smoking man or this or that'. She was adamant."

Michael previously described how he suffered a "sledgehammer to (his) reality" when his eldest son Noah, 11, was diagnosed with cancer.

The crooner had to reset his priorities after his child was diagnosed with a rare tumour at the age of three as he cancelled his tour to be with him during treatment.

Buble - who also has children Elias, eight, Vida, six, and Cielo, two, with Luisana - told the 'Diary Of A CEO' podcast: "My son's cancer diagnosis rocked my world.

"It pulled the curtain from over my eyes. I don't want to get deeper into it, but I don't think I had context.

"That was a sledgehammer to my reality - I will never be carefree again in my life, and that's OK.

"It is a privilege for me to exist and that pain, fear and suffering that comes with those sorts of things, it's part of this life."