AceShowbiz -

Alessandra Ambrosio flaunts her sexy post-baby body in a brand-new Victoria's Secret photo. The mother of two shows off her hourglass figure in $2.5 million Floral Fantasy Bra Gift Set, while giving a smoldering look to the camera.

The underwear she wears consists of a push-up bra adorned with amethysts, sapphires, rubies and diamonds. It's completed with a removable 20-carat white diamond in the center and a matching belt, made of more than 5,200 precious gems.

The picture emerges five months after Ambrosio gave birth to her second child, a baby boy named Noah. The fiancee of Jamie Mazur herself is scheduled to model the sexy underwear on runway at upcoming fashion show airing December 4 on CBS.

The 31-year-old model told PEOPLE she got the phone call from Victoria's Secret when she was breastfeeding her newborn son. "I just wanted to scream," she remembered. "But I won't lie, I was really worried. I was in total mother mode."

Once she got permission from her doctor to start working out, Ambrosio did yoga, pilates and spin for cardio to lose her baby weight. Her kids also helped her routines. "I was playing a lot of volleyball on the beach, swimming and running after my kids. And breastfeeding always helps," she dished on.

For her daily menu, she had fresh green juices, kale salads and fish, while indulging herself in occasional pizza or ice cream. "My daughter loves cupcakes so we'll share ... but only sometimes!" she revealed whom she enjoyed the sweet treat with.

About the sexy Fantasy bra, Ambrosio gushed, "It was perfect for me." She added, "I felt they made it for me. It's very romantic." The Gift Set was designed by Long Island's London Jewelers who made the Fantasy Treasure Bra Miranda Kerr modeled last year.