A rare unpublished work by Harry Potter author JK Rowling is going under the hammer for a whopping 25,000 pounds. And the piece of work is a hand-drawn, personal horoscope and natal chart, which Rowling gave to the newborn son of a friend at the time she was writing the first Potter book. The multimillionaire writer, who celebrates her 45th birthday today, had met the parents of the boy at b... more.