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Christina Aguilera has been a coach on six seasons of The Voice.
She was a permanent fixture for the first three seasons (1-3) and then returned for three more seasons spread out across the show (seasons 5, 8, and 10).

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Christina Aguilera has been a coach on six seasons of The Voice.
She was a permanent fixture for the first three seasons (1-3) and then returned for three more seasons spread out across the show (seasons 5, 8, and 10).