As part of World Book Day on Thursday 4 March, JK Rowling took part in a special webchat, talking about her books, what she likes to read and how she writes.
We gave one lucky fan the chance to have their question answered by the Potter author.
We short listed the best and the winner, chosen by JK, was 11-year-old Stacey from Plymouth.
Stacey asked JK: "If you got the chance to take some a polyjuice potion who would you be and why?"
JK replied: "I'd like to be Tony Blair for an hour. I'd call a press conference and announce all the policies I'd like to implement."