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Christina Aguilera

Gregg DeGuire/WireImage

Now this is what we call a body transformation!

Over the weekend, Christina Aguilera stepped out looking better than ever in sexy pink dress that showed off her newly slimmed-down figure.

And while we're in utter amazement of the star's recent weight loss, we should note that it's been a gradual and healthy process that we've been watching closely over the last few months.

Back in May, Aguilera wowed us on stage at the Billboard Music Awards, where she accompanied Pitbull for their song, "Feel This Moment."

The Voice coach belted out high notes in a simple LBD, and while her vocals were pitch perfect as always, it was her slender figure that really had fans buzzing.

Prior to that appearance, she had tweeted a photo wearing black bra and matching pencil skirt that put her trim figure on display quite nicely.

Wow!

Looks like her weight loss is doing wonders for her self confidence, too!

Wondering what the secret is behind her new look?

Sources close to Aguilera confirm she has taking a healthy approach to her body makeover. "[She's] making herself a priority, trying new exercises and trying things she loves and enjoys rather than stuff to just 'lose weight.' This is really from the inside out."

Looking good Xtina!