Rupert Grint, Emma Watson, or Daniel Radcliffe said this week's blind quote...but do you know which one?

Here's the quote to see if you can guess:

"I just knew, from the moment I read Harry Potter and the Sorcerer’s Stone that I was meant to play that role. I put one of the Potter films on the other night. And it was amazing to me that I had done all of that. I have to remind myself every now and then.”

Hmm, which one of the three could it be?