Kate Bosworth Sings In Topshop Christmas Film

Topshop finally revealed the new campaign star behind those #whosthatgirl tweets that've been trending over the past five days.

Actress, jean and jewelry designer, model, muse, and now singer, Kate Bosworth brings some Hollywood holiday cheer as the face and voice of Topshop's first ever Christmas campaign.

Directed by her fiancé Michael Polish, Bosworth sings Winter Wonderland on top of a grand piano wearing a custom-made shimmery red dress. (The festive dress, which Kate created alongside the Topshop design team, will be available as a special made-to-order purchase on starting in February 2013!)

"Kate has the most amazing voice - that's the part that takes everyone by surprise," Topshop creative director Kate Phelan told Vogue U.K.

"We were all working on an idea to celebrate Christmas in a fun way and we just loved Kate's attitude and energy," said Phelan. "She is always pictured wearing Topshop and we love how she makes it her own. I feel like she embodies so many of the qualities of our girl - she appeals to everyone because she loves fashion and that's something we can all relate to regardless of age. Topshop is built on being able to cater for everybody no matter who they are or where they come from."

The song in the mini-movie is currently available to buy on iTunes.