Kelly Clarkson and Justin Guarini just had a long-overdue reunion
Susan Boyle recreated her viral audition on 'America's Got Talent'
This 11-year-old's 'America's Got Talent' performance made history
Tons of celebrities attended Simon Cowell's Hollywood Star ceremony
Watch This Children's Choir Sing A Moving Cover Of 'Moana' on 'America's Got Talent'
Singing dog on 'America's Got Talent' was so good he even wowed Simon Cowell
Watch This Shy 13-Year-Old Stun the 'America's Got Talent' Judges With Her Singing