‘AGT’s’ Howie Mandel, Julianne Hough & Gabrielle Union Surprise 10-Year-Old Violinist!

Karolina Protsenko is the next big star! The now-viral violinist stopped by Access Live to dish about her rise to fame. Plus, Howie Mandel, Julianne Hough and Gabrielle Union give the 10-year-old girl surprise advice about being the next “America’s Got Talent” star. Watch to find out what they said!