Adam Levine has revealed that filming for the next season of The Voice has started before the current one has even finished.
The Maroon 5 frontman works as a coach on the US talent show alongside Christina Aguilera, Cee-Lo Green and Blake Shelton, but Aguilera and Green will not be working on the next cycle.
They are being temporarily replaced by Shakira and Usher, both of whom Levine has spoken highly of.
"We're doing season three now, obviously, which has been really fun," he told Ellen DeGeneres. "But now, we're also shooting the beginning of season four, which is really funny because we shot with Usher and Shakira the other day. And that was the first time we did that, which was trippy, because it wasn't the original people, but it was also a lot of fun.
"I remember thinking to myself, I love these guys, but just miss Cee Lo and Christina. But then I realized, it's OK because I'm going to see them in a week from now."
The Voice again trounced The X Factor USA in the ratings on Wednesday night, when the two went head-to-head for the second time this year.
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