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10th July 2017
05:45pm BST

The Harry Potter author told CNN that she wrote the text across the dress that she wore to her 50th birthday party.
The theme of the party was to "come as your own private nightmare."
“And I went as a lost manuscript. And I wrote over a dress most of that book."
But fans of the author shouldn't get too excited, because Rowling says she doesn't know if the novel-in-the-dress will ever actually be published.
We'll give her a few years.Explore more on these topics:

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