Actress Natalie Portman, 29, seen here in a still from "Black Swan," told UsMagazine.com that she'd lost 20 pounds while following an intense exercise regimen for her role as a ballerina. The 5 feet, 3 inch actress reportedly began training a year before shooting began. "I think it was just the physicality of it all that was the most extreme," she said Monday at IFP's 20th Annual Gotham Independent Film Awards in New York, according to Us. "I mean, I had never gotten that much training. To be doing five-to-eight hours a day of [it] was really a challenge." (Courtesy of Fox Searchlight)