Lena Headey

Oh, sure, there are some actors and actresses who look exactly like their TV alter egos. (Hi, Zooey Deschanel!) But there are some who owe a big debt to the makeup, hair, and wardrobe departments (and whoever makes Jon Hamm shave on Mad Men). Good acting is one thing, but a good costume can make or break a character. Click through for all the actors we spotted at the Emmys who undergo some amazing transformations for our viewing pleasure every week.

Obsessed? So are we.