Hmm...she reminds me so much of Jean Seberg, though not as sophisticated. I think it's just the pixie!
Anyway, the dress. Surprised that it's from Victoria Beckham's collection. (I usually associate super vampy and showstopping with VB.) Is this what whimsical looks like? And a bit of Japanese-twee-avant-garde? In any case, she's got people looking and talking about her, and it certainly doesn't look like your 'typical' sexy leading lady high-profile dress, being a little shapeless. It's different. It suits her public persona, I think.