Though the guesses have been flooding in on Twitter, we still can't figure out who the star of Topshop's 'Who's That Girl' campaign is.

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Our only clues so far are the star's sparkly red dress and her obvious reference to Michelle Pfeiffer in The Fabulous Baker Boys.

Who do you think it is? Have your say on Twitter (@Topshop_AU) using the hashtag #WhosThatGirl.