I'll give you a clue... this country star is as big as they get, and he was 23 when this performance was taped.  Once you hear him sing, you should be able to figure it out.

 

Yep, it's Keith Urban!  I'd say his style has evolved both musically and image wise.  And by the way, if you ever get a chance to see him, he puts on one of the best shows I've seen.