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Christina Aguilera over the years: 21 Sexiest looks (Photos)

<div class="meta "><span class="caption-text ">Christina Aguilera, a co-judge on the NBC singing competition series &#39;The Voice,&#39; walks the red carpet at the network&#39;s summer 2013 press tour event in Beverly Hills, California on July 27, 2013. (Tony DiMaio &#47; Startraksphoto.com)</span></div>
April 1, 2014 7:30:30 PM PDT