Vaguely resembles Natalie Portman. The eye color is correct and the moles are in the right spots... Yeah, Natalie Portman is my final answer.
EDIT: More evidence is the fact that FoRender just released their version of Natalie Portman, and also, after I made my guess I went to the DAZ forums to see if the individual who keeps the MDC celeb list updated over there had added #21. Sure enough they have, and they too believe she looks like Natalie Portman. That's good enough for me!