The 46-year-old star, who announced that she was expecting a baby with fiancé Olivier Martinez just last Friday, was positively glowing as she attended "The Call" premiere in Buenos Aires on Monday.
Cradling her tummy as she posed for photos, Berry wore a slinky, one-shouldered purple gown with beaded detailing that displayed her growing belly. She paired the dress with diamond drop earrings, a nude lip and smokey eye makeup.
Her large green emerald engagement ring also proudly on display.
Berry, who already has a five-year-old daughter, Nahla (with her former Canadian boyfriend Gabriel Aubry) told Us Magazine: "This has been the biggest surprise of my life, to tell you the truth. Thought I was kind of past the point where this could be a reality for me. So it's been a big surprise and the most wonderful."
This isn't the first sexy maternity look that Berry has rocked so far; she sported a plunging black gown with a daring slit for the Watch Hunger Stop campaign in New York on Saturday.
And we expect she won't be swapping in her curve-hugging attire for frumpy frocks any time soon.
Check out the photos below and tell us what you think of Halle's sexy pregnancy style!