While she’s moved on to a series of adult novels, JK Rowling hasn’t abandoned the Harry Potter universe. She’s just added a new piece to her free membership site Pottermore in the form of a biography of Celestina Warbeck, a half wizard, half muggle singer:

Celestina Warbeck is one of my favourite ‘off-stage’ characters in the Harry Potter series, and has been part of the Potter world ever since its inception, making an early appearance in the short-lived ‘Daily Prophet’ series I produced for members of the equally short-lived fan club run by my British publisher, Bloomsbury. Although we never lay eyes on Celestina during the whole seven volumes of the Potter books, I always imagined her to resemble Shirley Bassey [pictured] 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.

The full character bio is available at Pottermore, and has also been reproduced in full (with permission) at Today.com.