Carter Rubin is certainly the singer to look out for The voice this season. After moving to tears earlier this season, 15-year-old Kelly Clarkson caused Gwen Stefani to collapse in the semi-finals on Monday night for his portrayal of “Rainbow Connection” by The Muppets. The talented musician showed off his incredible singing as he sang the heartwarming melody. He even put his own note on the iconic melody, with some nice high notes at the end. Needless to say, by the end of the performance, Stefani was in her feelings. “That was fine,” she said. “That was God who answered my prayers … You are so gifted, you are so intuitive, your heart is full of music. I am so honored that you chose me and I cry and I am so happy and I love this damn show. “Aww! Stefani is certainly a proud coach. Watch his incredible performance above.