July 27, 2012 04:00 PM

Jamie McCarthy/WireImage

Camila Alves McConaughey hoped her baby belly wouldn’t throw a wrench in her career — and thankfully, it hasn’t.

The model signed on as the face of Macy’s I.N.C. International Concepts’ campaign in April, and discovered shortly thereafter that she and husband Matthew McConaughey had their third child on the way.

“A week before we were supposed to have a photo shoot, I found out I was pregnant!” the Brazilian beauty, 29, tells PEOPLE.

“I was over the moon, but my first reaction was that it was going to be a deal-breaker for the campaign — that they wouldn’t want a pregnant mom — but we worked it out.”

The mom-to-be was joined by Matthew, 42, at a party celebrating the campaign, held Wednesday at No. 8 in New York City.

Her husband will portray an AIDS patient in his upcoming film The Dallas Buyer’s Club, which begins shooting in September, and the pounds he’s lost for the part have become noticeable, admits Camila.

“He’s losing weight for his new movie and he still has to lose more,” she explains. “But I’m very supportive. I’m usually the one right there saying, ‘You can’t eat this, you can’t eat that,’ but he’s very disciplined. He’s really great at it.”

— Lilly Workneh

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