From Princess Diana to modern-day muses, Valentino's designs have defined timeless glamour on the world's biggest red carpets. Here's a look at his most iconic red carpet marvels. Princess Diana wore a burgundy velvet and lace Valentino gown while attending Paul McCartney's Liverpool oratorio in France.The rich fabric and intricate lace details reflected her evolving, confident public image.Minimal styling allowed the craftsmanship and colour to take centre stage. Julia Roberts accepted her Oscar in a vintage black-and-white Valentino gown from 1992.