Who plays the role of Patrick Bateman in the 2000 film 'American Psycho'?

I'm on the verge of tears by the time I got to this question, since I'm positive I won't know the answer, but I did. The relief washes over me in an awesome wave.

Funny movie and horrific book. So gross and offensive. Glad Mary went with absurd angel and not the unbelievably over the top violence of the book.