Despite the fact that Hudson gained 60 pounds when she was pregnant with son Ryder, she was back to her slight 112 pounds in what seemed like a nanosecond. She told reporters that she ate a pint of ice cream every day while pregnant and was "big and fat and jolly" -- then had to drop the weight fast in order to star in The Skeleton Key, which began filming three months after Ryder's birth.
How she did it: Under the supervision of trainer Joe Horrigan (who was hired by the movie studio), Hudson worked out two to three hours a day, six to seven days a week. The grueling regimen: walking, lifting weights, yoga, and Pilates. Her workouts, combined with a 1,500-calorie-per-day diet, melted off the pounds in about two and a half months.