The storyline saw Meryl Streep's character Miranda Priestly request that her assistant Andrea Sachs (Anne Hathaway) retrieve the unpublished manuscript of the final book for her children.
Speaking to Nylon magazine, Wright - Ginny Weasley in the movies - insisted that the cast never had early access to the books.
"Actually, the most grating thing I've ever seen in a movie is in The Devil Wears Prada, when those two little kids get the Harry Potter books ahead of time," she said. "I was like, 'Are you kidding? That would never, ever, ever happen!'"
She continued: "[J.K. Rowling] is so guarded, and she always wants everything to be released at the exact same time. Even the international translators would only get the books when they were already on sale, so nothing leaked out.
"Everybody - I mean everybody: Dan [Radcliffe], Emma [Watson], everyone - had to wait just like you."
Harry Potter and the Deathly Hallows: Part Two opens in cinemas in the UK and USA on July 15. Watch a first-look at the film below:
> Bonnie Wright: 'Destroying Hogwarts was fun'