Fans of the boy wizard series will know that Ron Weasley's mother's favourite singer is Celestina Warbeck.

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They will also know that Molly Weasley often subjects them to Celestina's many hits, including A Cauldron Full of Hot, Strong Love.

Although only ever mentioned in brief throughout the successful book series, JK Rowling has now released a short story in which Celestina is the star.

Speaking of the new biography, she said: "Celestina Warbeck is one of my favourite 'off-stage' characters in the Harry Potter series.

READ: JK ROWLING WRITES NEW HARRY POTTER SHORT STORY – AND TAKES A SWIPE AT TABLOID JOURNALISM

"Although we never lay eyes on Celestina during the whole seven volumes of the Potter books, I always imagined her to resemble Shirley Bassey in both looks and style.

"I stole her first name from a friend with whom I worked, years ago, at Amnesty International's Headquarters in London; 'Celestina' was simply begging to be scooped up and attached to a glamorous witch."

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The new excerpt reveals that Celestina attended Hogwarts, was in Gryffindor house and was born to a wizard father and muggle mother.

She has been married three times, first to dancer, then to her manager, with whom she had a son before leading him for a composer.

You can listen to Celestina's hit single You Stole My Cauldron but You Can't Have My Heart over at Pottermore.com.