And I was excited I could see the reporters arriving and the cameras taking pictures and filming the crowd.
The last half an hour was the worst part of the waiting, as it seemed like ages!
When the actors finally did arrive I cheered with the rest of the fans and tried to see all my favourite stars.
I saw Daniel Radcliffe, Tom Felton, Rupert Grint and Emma Watson, as well as my favourite actor Alan Rickman, and Mark Williams.
I had a great time there, and I'm definitely going to the premiere of the next film.
But this time I will be quicker in trying to take home a 'souvenir' of the day - like many of the other fans, who took all of the Chamber Of Secrets posters from the metal railings!
Katie, 14, London
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