"It's the only thing that fits me right now!" Gisele Bundchen joked after being complimented on her Halston cocktail dress.
But the pregnant star, stepping out for the opening reception of friend Mario Testino's 'In Your Face' exhibit, looked wonderful in the black, ruched creation.
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It showed off the 32-year-old's blossoming baby bump to perfection, while giving a sexy glimpse of her endless pins and outlining her slim frame.
And the Brazilian beauty might have spilled the beans about her pregnancy on the red carpet, with onlookers overhearing her telling Mario: "Only four months to go!"
She happily posed up on the red carpet with the renowned photographer and US Vogue editor Anna Wintour.
Meanwhile, fellow Brazilian Alessandra Ambrosio was also causing a stir at the event.
The supermodel, who was recently revealed as the latest Victoria’s Secret Angel to model the coveted 'Fantasy Bra', had an Angelina moment as she turned up to the event.
Wearing a long black gown with a thigh-high split, the 31-year-old’s left leg was entirely on display as she struck a pose very similar to Angelina Jolie's infamous Oscar appearance.
Gisele is featured in the collection of the famed photographer's fashion and celebrity shots, and she spoke of how excited she was that Mario was choosing to open the exhibit in Boston.
"I was like, 'Are you kidding? I'm there.'," she said.
"I was so excited he’s coming to the town I’ve been living in for five years. I love Boston."