Christina Aguilera Debuts INSANE Post-Baby Body, Matt Rutler

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Christina Aguilera stepped out Sunday night for a red carpet event, and with the aid of a gorgeous red gown, showed off her amazing post-baby body.

Check out the pop star with fiance Matt Rutler at the Breakthrough Prize Awards at Hangar One, a former NASA airship shelter, in Mountain View, Calif.:

The singer welcomed daughter Summer Rain just under three months ago, and clearly her efforts to shed the baby weight have yielded some impressive results.

Her figure hugging, full length gown was as bold and eye-catching as The Voice coach herself, especially with her blonde curls and matching red lips.

Aguilera, who will return for The Voice Season 8, been working on new material in the studio, and took to the stage for a rousing rendition of her 2002 hit "Beautiful."

She was one of the stars the show, which honors pioneers in math and science and was attended by the likes of Kate Beckinsale and Cameron Diaz.

How did she achieve that kind of transformation?

"Christina has hired a trainer and is really dedicated to getting thin," one source said. "She lost 46 pounds from changing her diet and working with a personal chef."

Seems like it's paying off, and then some ...

How does she compare to these other slimmed-down celebrities? That's for you to decide, but Christina has proven that she can look very sexy at any weight.

Talk about a woman who can do no wrong.

Christina also has a son Max, 6, from her marriage to Jordan Bratman. She and Matt Rutler have been together since 2011, and got engaged earlier this year.

All the best to the new parents!

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Christina Aguilera Biography

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Christina Aguilera: The dirrrty one always has a place in our hearts. She's a great, great singer. The beauty married Jordan Bratman a... More »
Born
Birthplace
Pittsburgh, Pennsylvania
Full Name
Christina María Aguilera

Christina Aguilera Quotes

It's kind of hilarious! I've never fit into an E-cup before. I look at my husband and go, 'Guess what size this bra is?' And when I tell him, he's just amazed. We keep the tags that prove it, to look back for memory's sake!

Christina Aguilera [on her breastfeeding bust size]

Oh, my God, candy! I had a huge craving for candy toward the end of the pregnancy, from Starbursts to Skittles. I actually took a picture of myself with my big belly in a little lingerie top, surrounded by bowls of the candy I like

Christina Aguilera [on pregnancy cravings]