Christina Aguilera Sings "Say Something" With A Great Big World at 2013 American Music Awards (VIDEO)

Keeping on trend with tonight's subdued theme at the American Music Awards on November 24, 2013, The Voice coach Christina Aguilera stunned fans when she took the stage for an understated and utterly heart-wrenching performance of her new hit "Say Something" with indie band A Great Big World. We almost can't believe this is the same woman who used to prance around in assless chaps and cornrows! Though we can't stop gushing about Xtina's weight loss and makeover — er, makeunder — we'd be...


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