I've seen her in various shows and movies over the years. I think she's absolutely stunning and she's even more so in Under the Dome
It's a real shame that she was fired from the Twilight saga because of a 10-day shooting overlap with another movie. That's the official story, but some say that there was an opportunity to get Bryce Dallas Howard onboard, so they used this overlap as a convenient excuse to let her go. Don't know how much truth there is to that.
Needless to say, she was stunned by the firing and decided not to attend the premiere of New Moon
because it was too emotional.