Christina Aguilera Bares Toned Midriff, Looks Skinny on The Voice Finale

The diva is back! Though she didn't mentor any contestants during the fourth season of The Voice, Christina Aguilera made a grand return for the NBC hit's June 18 finale. Showing off her estimated 20-pound weight loss in a black pencil skirt, a sheer metallic top and a hot pink bra, the four-time Grammy winner performed her No. 1 hit "Feel This Moment" with Pitbull.

"How cool was that seeing Christina tonight?" Blake Shelton asked reporters backstage. "She looks amazing, by the way." Aguilera and Cee Lo Green will join Shelton and Adam Levine for Season 5 after Shakira and Usher stepped in for Season 4.

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