NBC The Voice announced on Monday that pop star Christina Aguilera and funk singer Cee Lo Green will be replaced by soul singer Usher and Latin pop star Shakira on Season 4.

“We are thrilled to welcome Usher and Shakira to The Voice. The addition of these popular iconic artists continues the tradition established by Christina, Cee Lo, Adam and Blake,” NBC Entertainment chairman Robert Greenblatt said in a statement.

Aguilera will be leaving to promote her new album “Lotus”. She will be doing a worldwide tour starting this November. While Cee Lowill be working on his upcoming solo album, new Goodie Mob album, his Las Vegas residency Loberace, a memoir and a new NBC comedy.