The Voice Season 3 just got underway, but is there already a casting shake-up in the works for Season 4? According to a new report, at least, there may well be:

Usher and Shakira are replacing Christina Aguilera and Cee Lo Green.

Alleged insiders say Shakira and Usher would take the place of Christina and Cee Lo alongside Adam Levine and Blake Shelton at the end of the current season.

Earlier this month, Aguilera opened up to Ryan Seacrest about the show, admitting she once viewed her job as a coach on The Voice "kind of like a side project."

"[I thought], 'It'll keep me close to my son [Max, 4] in L.A. I don't have to travel," the Grammy winner said. "Then it kind of took off, and there goes my free time!"

The Voice sources say Christina will use her break from the program to focus on tours and promotional duties surrounding the release of her new album, Lotus.

Christina Aguilera's "Your Body", the first single from the upcoming record, is already out. Green, for his part, is currently working with NBC on a new show.

The rumor comes just as speculation surrounding American Idol's revolving door ends: Nicki Minaj and Keith Urban will join Randy Jackson and Mariah Carey as judges.