Christie Brinkley was and still is one of the most hardworking supermodels out there. She got her start in the 70s when she covered the SI Swimsuit issue, and signified the new generation of stars who were shot in more sportswear than couture. This founding queen of athleisure had a long-lasting contract with Cover Girl from the 70s to the 90s, and today, she’s just as much of a babe with that million watt smile. In 2018, she was in the swimsuit issue again! At 66, we need to know what fountain of youth elixir she’s drinking.