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Former "Voice" mentor Christina Aguilera and music icon Cher also performed on the NBC reality show, and they were hot!
Aguilera showed off a slimmer figure in a tight black pencil skirt and see-through metallic blouse that revealed a hot pink bra underneath. She performed "Feel This Moment" with rapper Pitbull.
According to Us Weekly, the singer dropped about 20 pounds after she fa...