SPOILER WARNING: This story discusses plot details for “ The Devil Wears Prada 2 ,” in theaters now. Last fall, Lady Gaga ’s fans worked themselves into a frenzy when they spotted her in Milan amid her sold-out Mayhem World Tour. Her presence was conspicuous since she was in between shows in London and Stockholm — plus the long-awaited sequel to “The Devil Wears Prada,” starring Meryl Streep, Anne Hathaway, Emily Blunt and Stanley Tucci, was filming in the Italian city for fashion week. MCU