Reminds me of Joseph Fiennes from....
Shakespeare in Love (a must-see if you haven't). I had to come on imdb just to see if they were related.
However, I found that Joseph Fiennes is brother to Ralph Fiennes (Voldemort from Harry Potter), and he has a fraternal twin & a large family in showbiz.
But if you look at pics of Theo James and Joseph Fiennes, they could be brothers. They have that same intense stare and way of acting.
But I agree with another poster that he looks like a male version of Cindy Crawford...
His acting was great in Divergent! Good enough to want to know more, thus my coming to imdb...