VIDEOSChristina Aguilera Warns Adam Levine and Blake Shelton To Be Nice To Shakira On 'The Voice'
March 20 2013, Published 4:41 a.m. ET
A new era of The Voice begins March 25 as Shakira and Usher join season four as judges. They will mentor alongside Adam Levine and Blake Shelton this season as Cee Lo Green and Christina Aguilera are expected to return for season five. Christina may not be a mentor this season, but she is still looking out for the new judges, especially Shakira. She tweeted out this week, "Know how u boys can get @adamlevine @blakeshelton so watch locker room humor & treat @shakira like lady she is on new #TheVoice #girlpower."
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