"Who's That Girl?" reads a Variety headline in the early stages of 'The Artist.' The subject of that query is Peppy Miller, an unknown wannabe actress thrust into the limelight when she stumbles, literally, into silent film star George Valentin (Jean Dujardin) outside the premiere of his newest hit. Of course, it's also an apt question for the woman playing Peppy Miller -- Berenice Bejo, the 35-year-old Argentine-born French actress who has been the recipient of her own spotlight this fall as a possible Best Supporting Actress contender for her work in the new film. Who's that girl?