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Victoria's Secret supermodel Alessandra Ambrosio is ready to reveal her own secret: She's pregnant again, her rep confirms to Us Weekly.

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The Brazilian beauty, 30, broke the news to Brazilian magazine Istoe Gente. "I'm going to be a mom!" Ambrosio exclaimed. The baby-to-be will be the second for Ambrosio and California businessman Jamie Mazur, her longtime fiance, who are already parents to daughter Anja, 3.

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She adds to the mag that she is four months along -- she surprised her man with the happy news (and a positive pregnancy test!) on his birthday in September -- but does not yet know the gender of their child.

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The stunner kept her baby-to-be (and her bump!) under wraps while strutting the catwalk just last month in lingerie for Victoria's Secret annual fashion show.

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