Michael Bublé ain't waiting for his wedding to sport a ring on his finger -- the engaged singer is already sporting some hardware ... claiming it's a "tradition" in his fiancee's family.

Bublé-- who's been engaged to his Argentinian girlfriend Luisana Loreley Lopilato de la Torre since November -- explained to a crowd in Canada last night, "The boy also wears the engagement ring (in Argentina). That's what she tells me anyway."

So we gotta ask ...

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