And not only that, JK's magical books take up four of the top five places in the 2001 best-selling books list.
The popularity of the book means so far 1,102,532 copies of the Philosopher's Stone have flown off the shelves this year.
JK has become one of the richest women in the UK because of her wizardly tales and is on course to become the world's first billionaire writer.
And the film's still doing well too. It's dominated film charts for five weeks now, in the UK and the US.
But it has spell-binding competition from the Lord of the Rings trilogy. The first film, the Fellowship of the Ring, came out on 19 December and it too is meaning even more sales for JRR Tolkein's classic books.