Emily Browning speaks about Kristen as Bella

"It's not a regret. People love that cast so much. Kristen Stewart is just perfect in that role and I think that everyone can see that that was the cast that it was meant to be.
"I feel kind of bad for them sometimes, the way they're hounded by the media. I don't think that I could have been as strong through that as they have been."

Browning was invited to try out for the part after being described as the "favorite choice" by the novel's author Stephenie Meyer on her personal blog.
The Sleeping Beauty actress turned down the opportunity because she was "just exhausted" and "definitely didn't want to sign on to a trilogy" at the time.

Source Digital Spy Via robstenation Via Robsten Dreams