It was either Ben Whitshaw, Ben Barnes (who was taken at the time) or Ben Jelen. Sebastian was just made to be a Ben. Crazy.
It's only my favorite movie ever. Half of my Nihilism/Sebastian plot is because of ideas I get watching that movie and O.M.G. Paul Dano. &hearts I would probably leave my boyfriend for him. :/ And this is a guy I've been with for more than seven years. Yeah. Massive crush.