By Amber Goodhand - Radar News Editor
Season three of The Voice is currently airing, but it seems two of the popular coaches are being replaced on the fourth season, with Shakira and Usher taking the seats for Christina Aguilera and Cee-Lo Green.
Christina was recently quoted as saying her gig on The Voice took up a lot more time than she expected and she'd originally looked at it "kind of like a side project."
"I thought, 'It'll keep me close to my son in L.A. I don't have to travel. Then it kind of took off, and there goes my free time!" Christina said.
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