Michael Buble has given up alcohol to tour the world - because he fears he won't be able to perform well enough if he's drunk.
The Canadian singer had previously vowed to dilute his alcoholic drinks while performing, after veteran star Vic Damone berated the crooner for ruining his vocal chords with booze.
Buble confesses he is teetotal on his current global trek, as he wants to concentrate on giving his fans a good performance. He says, "I can't party on tour any more. I think it's part of getting older - you know your limits. I stay sober as I want to put on the best show. It's bigger now, so I need to be sharp."
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