Supermodels have to look good. Their careers, filled with print ads, runway shows, and commercials, are dependent on their looks so they’ve probably picked up a few beauty secrets along the way. Dr. Oz recently interviewed top supermodels, Cheryl Tiegs, Beverly Johnson, and Carol Alt, about how they’ve managed to look so great in their 40s, 50s, and 60s. Check out their tips, which include eating healthfully, getting enough exercise, and the truth about plastic surgery.