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

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