08/18/2003 at 01:00 AM EDT
It's more fun to be Bridget than Roxie. Preparing for the sequel to Bridget Jones's Diary, Bridget Jones: The Edge of Reason, which begins filming this fall, Renée Zellweger is trying to pack 20 lbs. onto the 106 or so she carried as Roxie Hart in Chicago. Last time the Bridget diet included Snickers bars, chocolate milk shakes and pizza. Exercise won't stop her: the 5'5" Zellweger, 34, has given up running due to a bone spur in her foot. There are better ways to gain weight, says L.A. nutritionist Hermien Lee. "Good food gives you a glow on the skin that you cannot get from ice cream."