When Topshop announced it was releasing video clues to slowly reveal the star of their first ever Christmas campaign, we thought: ‘We love a challenge.' But we have to admit, it’s been harder than we thought. A whisper of blond hair there, a fair skinned hand there... there’s not been much to go on. But after seeing this latest video clue, the fifth of the ‘Who’s That Girl?’ campaign, we think we might have got it. If our senses are not deceiving us, the star of the Topshop Christmas campaign could be Kate Bosworth, star of Superman Returns and super-stylish starlet. Bosworth has always been a fan of the high street brand, having worn Topshop to several events, so it would make sense. We'll have to wait another day to know for sure, but we can’t wait to find out.