During Monday's live show, the 15-year-old crooner took the stage to perform a stunning cover of Miley Cyrus' "The Climb," bringing coach Gwen Stefani to tears once again.
"I'm so happy for you," Gwen raved. "You're unbelievable, you're just so calm, and it feels like you're just meant to be doing this, and I know that America's gonna see that tonight."
"I gotta say, even though I'm supposed to be your competition, I've never felt that. This has been a tough year for everybody in the world, and to be to end this year, and sit in this chair and listen to somebody with your talent, with your heart...I'm a fan, man. Unbelievable."
Later in the show, Carter worked with pop hitmaker Justin Tranter on an original single, "Up From Here," that gave Gwen and Justin "chills" in the studio.
"I can't wait to see what happens [for you] after this show," Gwen raved after his show-stopping performance. "Thank you for trusting me. You're a beautiful person, in and out."
Rubin has wowed Voice fans, and coach Gwen Stefani in particular, all season -- from his powerful Blind Audition performance of Lewis Capaldi's "Before You Go" to his covers of Mariah Carey's "Hero" and The Muppets' "Rainbow Connection" that brought Stefani to tears -- and now he's got a shot at landing his coach her first-ever Voice championship.
Cast your vote for the season 19 finale by using The Voice'sofficial app, or on NBC.com/VoiceVote. And, for the first time this season, host Carson Daly explained, viewers can also vote using Google Assistant on their phones or Nest devices: Just say "Hey Google, vote for The Voice."
The Voice season 19 finale continues Tuesday, Dec. 15 at 8 p.m. PT/ET on NBC. See more from this season in the video below.