Clash of the Titans star Sam Worthington has been doing the rounds promoting his latest blockbuster in London and Los Angeles this week, accompanied by girlfriend, Australian stylist Natalie Mark. Sam hasn't strayed from his charcoal suit, open shirt, and chunky shoes look, but Nat's mixed things up a bit. She's worked a lilac satin gown in London, and a more flirty LBD teamed with Fendi heels in LA. I'm kind of unsure what the lilac number is about so I'm going with the black dress on this one. How about you, which coupled-up look do you prefer?