JK Rowling reveals she has a secret manuscript written on a dress that may never be published

JK Rowling has said that she has a secret manuscript hanging in her wardrobe that may never be published.

The Harry Potter author revealed that she wrote an entire book on a dress for her 50th birthday costume party and is undecided about whether to get it published.

“On my 50th - the theme of my 50th birthday, which I held at Halloween, even though that's not really my birthday, was come as your own private nightmare,” she told CNN.

Rowling decided to go as a “lost manuscript” and decided to write an entire children’s fairytale directly onto a dress.

“I went as a lost manuscript. And I wrote over a dress most of that book,” she said.

"So that book, I don't know whether it will ever be published, but it's actually hanging in a wardrobe currently."

The revelation came after journalist Christiane Amanpour asked the world-renowned author about rumours that she had written a politically-themed children’s book.

She added: “It wasn’t political in a sort of party-political sense.”

Talking about when she was first published, having written the first Harry Potter as a single mother on benefits, Rowling said that she was “so grateful” that she didn’t mind about the suggestion of a gender-neutral pseudonym.

“I was so grateful to be published, if they told me to call myself Rupert, I probably would have done,” she said.

“I actually quite like having a pen name, because… that feels like an identity and then I’m, in private life, I’m Jo Murray. And it feels like quite a nice separation.”