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Christina Aguilera is showing up her weight-watching critics by showing off her slimmed down figure.  The pop star tweeted a picture from the set of her new video this week, showing off her curves in a black bra and a snug black skirt while standing on a balcony. 

The first glimpse of Christina's toned bod came in March when she attended the season four premiere of "The Voice."  Sources tell she has been working out at home regularly and "exploring new methods of exercise" with different trainers after adding a few pounds to her petite frame in recent years. 

Christina's on-set tweet this week was from the video for her duet with Mexican singer Alejandro Fernandez, "Hoy Tengo Ganas De Ti," or "Today I Want You For Me" in English. 

Aguilera will be returning to her judge's role on the next season of "The Voice." 

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