Watch: Christina Aguilera & A Great Big World perform 'Say Something' at AMAs...

Being a featured artist is really working out for Christina Aguilera. She's gone back to her skinny former self and more importantly, she's enjoying some chart success. What more can a girl ask for huh?

Many of us would love to know her nutritional secrets. Her appearance from last years AMAs was such a stark contrast to the flawlessness we sighted last night. She looked amazing as she sang the emotional ballad 'Say Something' with songwriting duo A Great Big World. In fact, she delivered some of her best vocals in a long daggone time. She should really maintain these soft, raw 'Stripped'-style vocals. They have been severely missed around these parts.

Thoughts?