Actresses: time to panic. Meet "Emily". She make look real, and sound real, but brother, she ain't real. She's a motion-captured computer animation by Image Metrics:
Somewhere, George Lucas' head just exploded. To be fair, she doesn't look completely human. There are a few little ticks here and there, and the face is just slightly off. But if you pretend that's all the result of aristocratic inbreeding, the illusion is complete. And, you've turned her into an aristocrat.