Ever since her first Sports Illustrated cover in 1979, Christie Brinkley has been an emblem of all-American sexiness. In her heyday, the toned and leggy California blonde best known for holding the longest running contract in modeling history with CoverGirl (20 years!) bared her bod to model countless strappy bikini numbers, married Billy Joel, starred in a handful of music videos (including Billy's classic "Uptown Girl"), published an Outdoor Beauty and Fitness Book (replete with that essential advice for modeling on beaches) - and of course promoted Total Gym fitness equipment in infomercials alongside Chuck Norris. Whew. Today, the stunner turns 57 and we wish her the best. Check out a selection of Christie-inspired prezzies, followed by our favorite vintage moments of hers!