The 36-year-old Grammy winner will join Adam Levine, Blake Shelton and debutante coach Kelly Clarkson in the 14th season of the NBC musical competition, reported Deadline.
"We are thrilled to welcome back Alicia's positive energy, competitive spirit and sheer talent. She brings unparalleled expertise and has proven she knows how to help artists win.
"The chemistry among Alicia, Kelly, Adam and Blake will make for a wildly unpredictable and compelling season 14," said Paul Telegdy, president, Alternative and Reality Group, NBC Entertainment.
Keys last mentored in season 12 of "The Voice", where her team's contestant, Chris Blue was adjudged the winner.
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