NEW YORK — Move over, Spice Girls. This spring, looking like a pop star is easier than ever. Designers are taking their cues from an eclectic mix of rock icons such as Ann and Nancy Wilson of Heart, Stevie Nicks and Pat Benatar, for a “glammy Annie” look that combines vampish flash with a certain girly charm. Here, a silk chiffon dress from Ultra by Betsey Johnson (left) and Hourglass’s polyester camisole with Tramp’s mirror-trimmed silk skirt. For more, see pages 22 and 23.