Less than a week after Halle Berry, 46, confirmed that she and fiancé Olivier Martinez were expecting their first child, the actress flaunted her baby bump on the red carpet.

While attending the premiere of her new movie, "The Call," in Argentina, the Oscar winner dazzled in a purple gown that accentuated her stomach.

"This has been the biggest surprise of my life, to tell you the truth," Berry told CNN.com Monday. "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."

Berry, who also has a daughter, Nahla, 5, from a previous relationship with model Gabriel Aubry, added that pregnancy this time around had been easy: "I feel fantastic," she said.