Transformation

Whether it's a reality show, a fashion line or a new modeling endeavor, Heidi Klum finds success at every turn. Likewise, when it comes to her looks, the energetic mother of four is gorgeous in everything from short crops to waist-length extensions. Her secret? Aside from glowing good looks, Klum has the spirit of adventure. Says stylist Michel Aleman, who gave her a spur-of-the-moment Mick Jagger-inspired shag, "She is always ready to try something new."

The German-born model scored the cover of the Sports Illustrated Swimsuit Issue. "She didn't need makeup then, and she still doesn't," makeup artist Linda Hay has said of the bikini model.