Season seven of The Voice is just breaking into its battle round, but the NBC singing show has already secured its coaches for season eight.

See more 'The Voice' Coaches' Best and Worst Moments: From Push-Ups to Empty Praise

The spring 2015 cycle will feature Christina Aguilera and Pharrell Williams in the big red chairs alongside returning veterans Adam Levine and Blake Shelton.

Williams' return to the post for a second season in a row breaks the singing show's routine of rotating two coaches in every other season. And Aguilera reclaims her chair after taking one fall cycle off to give birth to her second child. She most recently coached in season five. The upcoming season will be the first time Williams and Aguilera appear together.

"We are excited to welcome Christina back to her red chair and can't wait to see how she mixes things up among Adam, Blake and Pharrell in what will be an incredibly competitive competition," Paul Telegdy, president of alternative and late night programming for NBC Entertainment said in a statement. "These four talented artists are at the top of their game as musicians and as coaches. The mentoring is sure to be intense, and the stakes will be high."

Carson Daly made the announcement on Tuesday morning on the Today show.

Email: Ashley.Lee@THR.com

Twitter: @cashleelee