ROSETTA RISING: Rosetta Getty, whose young designer label, Riser Goodwyn, premiered in 2006 with a well-received ready- to-wear and red-carpet collection (the line is a favorite of Getty pals Selma Blair and Patricia Arquette, as well as Angelenos Amber Valletta and Brooke Davenport), is launching Riser, a contemporary line of separates and dresses ranging from $45 to $250 at wholesale for spring. With a focus on classic wrap dresses in silk, the line, manufactured in Italy and Los Angeles, also comprises cashmere and jersey separates with clean lines and muted colors. Riser will be presented to department store and specialty buyers at the New York and Los Angeles markets in January. Riser Goodwyn, owned and operated by Getty, sells in Barneys New York, Kirna Zabête and Ron Herman.