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OTRC: Alessandra Ambrosio announces she's expecting a baby boy (Photo)

Alessandra Ambrosio poses in a pictures showing off her baby bump. They were posted on her official Twitter and Facebook pages on April 3, 2012. (facebook.com/Alessandra / twitter.com/AngelAlessandra)

Victoria's Secret supermodel Alessandra Ambrosio has an important announcement to make and it's written in the sand.

Ambrosio, 30, said in December 2011 that she was expecting a second child with her fiance Jamie Mazur. On Tuesday, April 3, she took to social media to announce that she expecting their first son. The supermodel posted photos of herself at a beach, wearing a T-shirt covering her baby bump. In one picture, the words "It's a boy" are written in the sand.

"We really tried to keep it a surprise but we were too anxious!," she posted on her official Facebook and Twitter pages. "Soon, we will have a little boy to rock our world!!"

Ambrosio, who is from Brazil, and Mazur, a California businessman, are already parents to a 3-year-old daughter named Anja Louise.

In January, Ambrosio debuted her baby bump at a fashion show in Brazil. The model wore several outfits by Colcci, including a baggy, printed, olive and maroon-colored see-through sweater and a blue, loose-fitting mini-dress, at the designer's show in San Paulo on Sunday, January 22. She was also pictured making a hand gesture to actor Ashton Kutcher, who sat near the catwalk.

Ambrosio has been a Victoria's Secret "Angel" for years. In 2011, she donned a push-up bikini to promote the lingerie brand's "Miraculous Push-Up" swimwear line. She said at the time that she has the "perfect job."

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