NEW YORK (UPI) US author Lauren Weisberger is working on a sequel to her 2003 blockbuster novel, “The Devil Wears Prada”. “Revenge Wears Prada: The Devil Returns” is to be published next April. The first book inspired the hit film of the same name starring Meryl Streep as Miranda as a NY fashion magazine editor and Anne Hathaway as Andy, her personal assistant.