Lena Headey

4. Lena Headey

According to the MTV Movie Awards, she gave a "breakthrough performance" in 300, but we've known since Imagine Me & You that Lena is hot stuff. Is it that slow smile, the sexy walk or the hair that can handle any style? Yes — and let's not forget the accent (there's a reason two British charmers made our top five). Watching Lena take down the bad guys in Fox's The Sarah Connor Chronicles next season will just be icing on the cake.