16-year-old Christian Guardino has been singing for as long as he can remember. Today, he's following his passion all the way to the America's Got Talent stage. Christian was a little nervous at first, but after talking with the judges his nerves started to calm. And when you hear him audition with this incredible rendition of "Who's Lovin' You" from The Jackson 5, you will understand why he earned Howie's golden buzzer. What an incredible moment!