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14. Christina Aguilera

Christina had the worst track record as a mentor on ‘The Voice,’ coming in third and fourth place, respectively in Seasons One and Two, while being the first to lose all her contestants in Season Three. Christina rarely gave any criticism or negative feedback to her own teammates, but had no problem doing so when it came to those of her fellow judges, particularly Adam Levine. Her sore loser attitude and strange fashion choices made her overall unlikeable as a judge.

(Photo by Kevin Winter/Getty Images)