You're thinking of The Devil Wears Prada, a famous movie released in 2006, starring Meryl Streep as Miranda Priestly, the demanding and powerful editor-in-chief of Runway magazine, and Anne Hathaway as Andy Sachs, a young journalist.
Emily Blunt was not in The Devil Wears Prada. However, she was in several other notable movies, including The Devil Wears Prada's sequel, The Devil Wears Prada's spin-off, and The Devil Wears Prada's prequel were not made; however the 'The Devil Wears Prada' character was featured in the 2022 film 'The Devil Wears Prada: About Last Night' but it was a TV series not a film.
