*raises his hand* I noticed her. Acting and looks wise. She was good then, she's better now.
Honestly, I don't like comparing her to Audrey Hepburn because...well...I never really liked Audrey Hepburn. Me thinking Natalie Portman is a better actress isn't much of a stretch.
That said, everything I've seen her in, she's impressed me. In Episode III, she had a very limited, very poorly written part...possibly the weakest part of the whole movie. Despite that, I loved the dark cynicism she packed into that one memorable line in the senate chamber...
Speaking of 'The Professional', I really loved that movie. It'd have been even more interesting had Besson been able to use all the material from the original script...