Christina Aguilera and Cee Lo Green plan to return after taking a hiatus to work on other projects

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Season 3 of The Voice has just begun, but the coaches are already playing musical chairs for season four.

Christina Aguilera and Cee Lo Green will take next season off and be replaced by Usher and Shakira, NBC announced Tuesday. Adam Levine and Blake Shelton are staying, at least through next season.

Both Aguilera and Green will take a hiatus to work on other projects – she will be touring to promote her new album, Lotus, while he’ll be working on new music and a scripted comedy about his life.

Both vow to return to the show eventually. “By pursuing my first passion of music during the break, I am also able to come back and offer even more to my team on The Voice in the future,” Aguilera said in a statement.

“I will return for season five and will be watching season four,” said Green.

“We are thrilled to welcome Usher and Shakira to The Voice,” Robert Greenblatt, the chairman of NBC Entertainment, said in statement. “Doing two back-to-back cycles of this show requires a tremendous amount of time and we are happy to accommodate the commitments made by Christina and Cee Lo.”