The mysterious star of Topshop's Christmas campaign has been unveiled.

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Click to watch Kate Bosworth's special video to marie claire readers!

Topshop has finally revealed the mysterious star of its Winter Wonderland teasers after keeping us guessing all week!

Actress Kate Bosworth is the girl in the sparkly red dress that kept us enticed for the last 5 days – a fitting match considering Topshop is known for its edgy style and Kate is one of our favourite fashionistas.

RELATED: Topshop Launches 'Who's That Girl' Winter Wonderland Campaign

Watch below as Ms Bosworth sings (yep, the girl can sing too!) on a set inspired by Michelle Pfeiffer in the 1989 cult classic, The Fabulous Baker Boys.

If you’re impressed by her vocals, you can buy the track and the short film on iTunes, along with The Fabulous Baker Boys and various films from Bosworth’s fiancee Michael Polish, who directed the short Topshop teasers.

And if you’re wondering about Kate’s fabulous slinky red dress, it will be available via custom order when Topshop opens in LA in February 2013. We’ll race you there.