The celebrated author of the Harry Potter series is expecting her third child next year, People magazine has reported.
But her pregnancy will not affect the progress of her sixth book, titled Harry Potter and the Half Blood Prince.
The 38 year-old has a daughter Jessica from her first marriage to Jorges Arantes. Last year she had a son, David, with her second husband, Dr Neil Murray.
The author's official website, jkrowling.com, quotes her saying: I always wanted three children, so I could not be happier.
Photograph: David Westing/Getty Images