Video: Kelly Clarkson joins coaches' panel for Season 14 of 'The Voice' br Don't forget subscribe my channel: br » Facebook: br br Grammy Award-winner Kelly Clarkson has signed on to serve as a coach for Season 14 of The Voice, NBC confirmed. br She will be joined by fellow mentors Blake Shelton and Adam Levine. A fourth coach will be named at a later date, the network said.