Heidi Klum poses naked in steamy new photo book

The first model to appear on the cover three times — in , left and — Tiegs, often considered the first American supermodel, went on to launch a clothing line for Sears, judge the ABC reality show True Beauty and welcome twins via surrogate at age 53 at the time, she already had one son. Now 65 years old, she recently completed a stint on Celebrity Apprentice , travels the country speaking about health and fitness and is an advocate for eco-conscious living. Brinkley also covered SI three times, appearing consecutively from left to before marrying Billy Joel in Mom to two young boys. When Ireland flaunted her figure on the 25th anniversary edition of SI in left , it went on to become the best-selling issue of its time.