See Christina Aguilera's Noticeable Weight Loss at 'The Voice' Premiere (PHOTO)

(L) Christina Aguilera shows off dramatic weight loss at The Voice's season 4 premiere in LA on March 20. (R) Xtina pre-transformation at the 2012 American Music Awards in October.

(L) Christina Aguilera shows off dramatic weight loss at The Voice's season 4 premiere in LA on March 20. (R) Xtina pre-transformation at the 2012 American Music Awards in October.

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