For decades, they were among the most famous faces in entertainment history: Marilyn Monroe, Grace Kelly, Romy Schneider, Audrey Hepburn, Farrah Fawcett, Elizabeth Taylor, Olivia Newton-John, Raquel Welch, and Brigitte Bardot left an indelible mark on 20th-century cinema, television, and pop culture. Behind their fame, however, were personal struggles, heartbreak, and, in some cases, tragic endings.