On-Chair Personality: Kelsea Ballerini will join Adam Levine, John Legend and Michael Buble as a coach for season 27 of NBC's The Voice next spring. She'll take the country music baton from season 25 coaches Reba McEntire, who is also confirmed for season 26 this fall, and Dan + Shay. Ballerini served as a battle advisor during season 16 and filled in as coach during season 20 for Team Kelly Clarkson.