It's official: Shakira and Usher are going to replace Christina Aguilera and Cee-Lo Green on season four of "The Voice."

Sources say Christina will take a break from the hit NBC show to focus on tours and promotional duties surrounding the release of her new album "Lotus," while CeeLo is currently working with NBC on a new show of his own.

Shakira and Usher will join Adam Levine and Blake Shelton as mentors next season.