What a difference a year makes!

Christina Aguilera showed how much she's changed since last year's American Music Awards at Sunday night's event -- looking like a completely different woman.

The singer made headlines when she hit the red carpet in 2012 in an unflattering purple dress that did nothing for her figure (left). Paired with her dark (and fake) tan, short wig and extreme makeup, it just wasn't a good look.

Flash forward to Sunday (right), where the skinner star showed up looking totally glam. She clearly stayed away from the tanning bed this time around, looking pale in a white gown with cutouts on the sides. 

We gotta say, we're loving this look -- it's such an improvement!

Christina also performed "Say Something" with A Great Big World at the ceremony on Sunday night.

What do you think of X-Tina's new style? Sound off below!

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