The husband-and-wife pairing will mentor contestants during the battles; Stefani shared that Aguilera coached her on the post during her son's birthday party.
'The Voice': Gwen Stefani Gets Gavin Rossdale as Advisor, Shares Christina Aguilera's Tips (Video)
Hollywood Reporter - 15 Jul 2014 18:29
The husband-and-wife pairing will mentor contestants during the battles; Stefani shared that Aguilera coached her on the post during her son's birthday party.
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