I can see at least on other person would go for Felicity. I always imagined her looking a bit like this...
Plump, but not obese. Self-confident (at least on the outside) and definitely English "posh totty".
Here voluptuous shape is so unfashionable, I don't think there's a modern actress or pop star who could play her.
Even so, the world is full of women and girls who actually look like this.
Who would you cast in the movie...?