But the Cambridge, Mass.-bred Affleck did fine-tune his act by the time he began work on last summer's megahit Armageddon. For the role of space hero, the film's producers had him slim down, pump up the pecs on his 6'2" frame and get his teeth capped. Recalls Smith: "When I saw him in the dailies for (1997's) Going All the Way, I said, 'Oh, my God, you are a movie star!' He was just cut and built, and he had matinee-idol looks." The effect apparently isn't lost on the 26-year-old actor, who has remained unattached since his January breakup with Gwyneth Paltrow. Though Affleck vowed to return to his burgers-and-beer regimen after filming...well, some promises are better not kept. "That dude's Diet Coke all the way," says Smith.