Kate Bosworth is That Girl New!

Kate Bosworth is today revealed as Topshop's 'secret' Christmas campaign star - and she has an exclusive festive message for GLAMOUR readers.

The actress is gunning for Christmas number one with her sultry version of Winter Wonderland, which she sings for the ad campaign, dressed in a specially-made Topshop dress and shoes and directed by her fianc?©, Michael Polish.

Says Bosworth: "This project brings together two important aspects of my life: cinema and fashion. I have always been a fan of the Topshop brand and it has been an honour to work with Sir Phillip and the team. I hope everyone enjoys watching it as much as we did making it."  

This year marks the first that the retail behemoth has run a Christmas campaign and it has been stoking interest for five days with a series of teaser videos and picture clues, inviting fans to guess which blond-haired starlet is its face under the hashtag #whosthatgirl. While many guessed correctly, Taylor Swift and Sienna Miller were popular punts.