Singer-actress Lady Gaga is set to make an appearance in highly anticipated 'The Devil Wears Prada 2', claimed reports. She was reported to be filming her scenes in Italy's Milan this week. 'The Devil Wears Prada 2' is a sequel to 2006 film starring Meryl Streep, Anne Hathaway, Emily Blunt and Stanley Tucci, who are reprising their roles.