Kate Bosworth has sparked speculation she is the Hollywood face of Topshop's festive advertisements after a 17-second video was released online.Kate Bosworth has sparked rumours she is the new face of Topshop's Christmas campaign after a new teaser video was released online. The popular high street retailer- which has previously worked on a range with Kate Moss - has released a series of clues to help people guess who the Hollywood star of their first ever festive ads is.A 17-second clip was recently revealed as part of the 'Who's That Girl?' campaign, with Elleuk.com speculating that it could be style icon Kate.The video shows a blonde woman dressed in a floor-length sparkly red gown, but the camera stops just shy of the actress' face. Kate, 29, is famously a fan of Topshop, choosing to wear several pieces to high-profile events. The stunning star is also known for her love of bohemian fashion - a staple style Topshop has in its stores. Kate is clearly a lover of all things fashion and was revealed as the spokesperson for luxury brand Coach in 2008. The blonde beauty has also fronted campaigns for Calvin Klein Jeans and has turned her hand to fashion design, launching her own jewellery line with her friend and stylist Cher Coulter in 2010.The famous Topshop lady will be revealed on Tuesday.