One fourth of the puzzle is officially in place.

NBC announced Monday that Pharrell Williams, whose “Happy” currently reigns as the number one single in America, will serve as a coach on season seven of “The Voice.” That seventh season premieres this fall.

Pharrell previously appeared on “The Voice” as a mentor for “Team Usher.”

“His dominance in record sales in 2014, coupled with his incomparable accomplishments in the world of fashion and design, make him an irresistible addition to ‘The Voice’ family,” said Paul Telegdy, President, Alternative and Late Night Programming, NBC Entertainment. “He has already made a considerable impact as a mentor, drawing on an impressive track record as both a producer and performer. It is a perfect fit for ‘The Voice’ as we evolve and reach for new heights with this franchise. It feels like we are welcoming an existing family member home.”

Insofar as NBC has yet to confirm the other three coaches for the seventh season, it seems plausible that at least one of the regular fall personalities–Adam Levine, Blake Shelton and Christina Aguilera–will not occupy a red chair this fall.

Fellow fall coach Cee-Lo Green had already confirmed his departure from “The Voice” in an interview with Ellen DeGeneres.

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