Birdman star Naomi Watts emerged a big winner on Feb. 22: Not only did her theater-themed movie take home four trophies including Best Picture, but her ensemble—a grayscale Armani Privé halter gown with beaded black cutouts, plus major sapphire drop earrings—was one of the night's most buzzed-about looks. Ultra-suave rapper-actor Common, one of the stars of Selma, proudly rocked a Prada tux and Fred Leighton bling, and later in the evening received another shiny accessory: an Oscar for the film's anthem "Glory," which he wrote and performed with John Legend. And presenter Scarlett Johansson, clad in a figure-hugging emerald Atelier Versace gown plus a Swarovski crystal collar, took the ear cuff to another level with her oversize Piaget design.  ON WATTSModern Art Deco earrings with 55.9 cts. t.w. oval blue sapphires, purple sapphires, and round brilliant-cut diamonds in wh