This humble 16-year-old shuts Simon Cowell up.

He's only 16, but you can't tell it by his voice.

While normal sixteen-year-olds this week are excited for the end of the school year here, Christian Guardino got the judges excited on Tuesday's "America's Got Talent" on NBC.

Gotta be pretty good to hold Simon Cowell speechless, right?  Check out how the humble kid did just that here...

The Mayor Pete Kennedy

The Mayor Pete Kennedy

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