Christina Aguilera's Stunning Weight Loss

Christina Aguilera stunned viewers of Sunday's 2013 Billboard Music Awards, when she took to the stage to reveal a dramatic weight loss.

The petite singer, who sang Feel This Moment with Pitbull, wore a black miniskirt and a tight-fitting black top, accentuating her newly toned figure.

Looks like she'll be in fighting shape for her return as a coach for season five of The Voice!