The star turned up before 8am to pose for photographers, and then went on to do a reading from Order of the Phoenix.

She said she was "delighted to be there" and said she was planning to read from chapter four, where Ron finds out he is a prefect.

But fans still beat her to it though. They started arriving at 4am!

One Potter-mad fan, Delilah, 12, from Holland, started queuing at 4am to make sure she got a good seat.