Royal Ascot celebrates the best on track and also brings out the best in dress at their star studded annual event. From Audrey Hepburn to Liz Hurley, Princess Diana to Holly Willoughby, over its three centuries, the stars have put their best heels forward to step out for the historic horse-racing extravaganza. We've taken a look back at the fascinators and frocks rocked by the famous faces over the decades and list some of the best sartorial stand-outs!.