Music
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Bublé, who is currently on the American leg of his world tour, admitted that drinking can ruin a performance.
"I can’t party on tour anymore," he told the Daily Star.
"I think it’s part of getting older - you know your limits. I stay sober as I want to put on the best show.
"[The show's] bigger now, so I need to be sharp."
The 34-year-old, who's latest album Crazy In Love has sold five million copies worldwide, will host his own An Audience With programme on ITV1 later this year.
Bublé will play a series of dates accross the UK in May.
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