Fourteen-year-old Carter Rubin might've delivered the most surprising audition on The Voice this season [1]. In a preview for Monday's episode, the teen took the stage in front of judges John Legend, Kelly Clarkson, Blake Shelton, and Gwen Stefani [2] to perform Lewis Capaldi's "Before You Go", and he blew them all away. "I can't believe what I'm hearing and seeing right now," Stefani said. "This is a shock!"

"You sounded polished, you sounded strong," Legend told Rubin. "Your voice has control, which a lot of people your age wouldn't have, and your tone is piercing and brilliant, and it just shimmers out there." Now that is a compliment. Watch the full performance above to see why the Stefani and Legend turned their chairs so quickly for the young singer. We can't wait to see who he picks as his coach!