The moment JK Rowling revealed a little more than intended

She is wizard at keeping secrets. Keeping her underwear to herself is obviously another matter.

The usually discreet JK Rowling found herself revealing a little more than she would have liked as she addressed a group of children in the US.

The writer who managed to keep Harry Potter's fate under wraps for seven books, bared her bra as she leaned forward.

Seemingly unflustered, she simply adjusted her neckline and kept talking.

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Miss Rowling, 42, and estimated to have a £500million fortune thanks to her Harry Potter novels, was reading to children at the Kodak Theatre in Hollywood when her dress let her down.

Her appearance was part of her first tour of the US for seven years.