Although some females fear turning 40, birthday girl Heidi Klum is making it look effortless, elegant, and downright inviting. With mile-long legs, cascading blond locks, and curves that could kill, it's no wonder Klum is one of the most sought-after supermodels in the world - but with titles like designer, TV host, and producer under her belt, the blond bombshell has proved her business savvy extends far beyond the scope of beauty.
Whether she's flaunting her fit figure in a body-con mini or posing on the red carpet in her sultry style of choice - plunging neckline, thigh-high slit, backless, or all three - we just can't get enough of Heidi's contagious effervescence. In honor of her special day, we are celebrating one of our favorite cover girls in all of her age-defying glory with a look back at 40 of Heidi Klum's sexiest looks.