Alessandra Ambrosio Pregnant: Model Poses Nude For Sexy Jewelry Ad [PHOTO]

Victoria's Secret model Alessandra Ambrosio posed nude for a new ad campaign with Brazilian jewelry company Vivara, all the while being pregnant with her second child.

At eight months pregnant, Ambrosio, 31, is pictured in the black-and-white ad wearing a pair of earrings, three rings, and a necklace by the designer.

A nude photoshoot was good, because pregnancy makes me much more confident. I'm proud of my body to be generating a life... I wasn't ashamed to do a nude shoot for two of my favorite photographers. I'm happy to have one of the most important moments of my life recorded by them, she said, according to the Daily Mail.

The shoot was conducted at the five-star Copacabana Palace Hotel in Rio Be Janeiro, Brazil by noted fashion photographers Mert Alas and Marcus Piggot.

Ambrosio is expecting a baby boy with fiancé Jame Muzar, a Californian businessman. She already has a daughter, Anja, aged three.

The model found out she was pregnant with her second child in the fall, right before the Victoria's Secret fashion show in November.

I didn't tell anybody so no one knew at the show that I was pregnant, she told Usmagazine.com in December. A week before, I told my booker I don't think I'm going to be able to fit into the clothes because I gained a few pounds already, but we were just quiet.

The lingerie model angel is eager to get back to her 34-25-34 frame in time to launch the Victoria's Secret store in London come July.

I told my booker and my manager; 'I know I have a job to do, so just book the jobs and hopefully it'll be fine', she said.

I only have a few more jobs to do before I have the baby -- all editorial, no more catwalk now -- and then I hope to be back in London for the opening of the Victoria's Secret store in July. I should definitely be back for the next Victoria's Secret show - I have quite a while until then.

Ambrosio just went on maternity leave after a promotional tour of Europe, that had her visiting Turkey, Poland, Germany, and Spain, ended last month.