HOLLYWOOD — It was a fabulous blast from the past. In an evening that could have come right out of the heyday of the silver-screen capital, the golden girl won the golden statuette for Best Actress in a vintage couture dress that could not have been more old-Hollywood. Here, Julia Roberts shows the back of her stunning Valentino couture dress from the fall 1982 collection. For more on the Academy Awards, see pages 5 to 36.