PICTURE: Gisele Bundchen Rocks Growing Baby Bump in Tight Dress

Gisele Bundchen and Mario Testino at The Museum of Fine Arts, Boston on October 17, 2012. Splash News Online

Gisele Bundchen is one hot mama-to-be!

Strutting down the red carpet at the Museum of Fine Arts in Boston Wednesday night, the Brazilian-born beauty flaunted her growing (but still tiny!) baby bump in a black, ruched Halston dress and black Tom Ford jacket.

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The supermodel, who's pregnant with her second child, was on hand to celebrate the opening of pal Mario Testino's "In Your Face" photography exhibit, a collection of fashion photos and celebrity snaps — some of which feature Bundchen herself.

Us Weekly first broke the news of the 5-foot-11 stunner's second baby-on-board back in June.

"Yes, she is pregnant," a source told Us, adding that the model was about "three months along" and "really happy."

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This will be the 32-year-old catwalker's second child with her husband of three years, New England Patriots quarterback Tom Brady, 35. The couple already have a 2-year-old son, Benjamin. (Brady also a 4-year-old son, Jack, from his relationship with Blue Bloods actress Bridget Moynahan.)

Bundchen has been tight-lipped about her pregnancy this time around, but in 2010, she opened up to British Vogue about wanting to expand her family.

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"I want more kids for sure, but I don't know when," she told the magazine. "For Benjamin, his big brother is his hero. Jack comes in and Benjamin has a big smile. He wants to follow him around. Anything he does, he's just in awe of him, like, 'Oh my God!'"

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