Nothing could've prepared the judges for 13-year-old Courtney Hadwin's performance on America's Got Talent [1] on Tuesday night. When the shy and shaky teen came out on stage, she was admittedly a little nervous, but when she opened her mouth (and our own jaws hit the floor), it was clear her talent superseded her fears. Performing "Hard to Handle" by Otis Redding, Courtney's powerhouse vocals [2] shined, and her incredibly passionate dance moves had judges comparing her to Janis Joplin [3]. Seriously, Heidi Klum [4] gasping "oh my God" says it all. "Bloody hell, Courtney," judge Simon Cowell [5] said. "You were this shy little thing when you first came out, and then you sing. You're like a lion." Watch the jaw-dropping video above, and see who gave Courtney their golden buzzer.