Kelly Clarkson clearly has closed the book on "American Idol" ... her go-to is now "The Voice."
We got Kelly in NYC where a hopeful soul busted out in song for the OG 'Idol' -- her song, of course -- and Kelly seemed impressed.
Check out the clip -- he might have a future with an assist from Blake Shelton and friends.
Kelly even reminisces on her old friend Justin Guarini ... wherever he is.
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