Happy Holidays from Kate Bosworth and her fiance, Michael Polish!

The stylish blonde beauty serves as the face of British clothing brand Topshop's stunning new holiday campaign, starring in print ads, plus a very special commercial -- directed by her filmmaker love.

"Topshop is a cool brand I've always worn, so to create this film with them was so much fun," Bosworth tells Us Weekly exclusively. "Michael and I got to hang out in London for a couple weeks to work with the whole team there -- we even got staff passes!"

The Homefront actress, 29, also assisted the Topshop Design Team in creating the gorgeous evening dress she wears in the video, in which she croons "Winter Wonderland."

Michelle Pffeifer's piano scene in The Fabulous Baker Boys helped inspire Polish's approach to filming the holiday spot, he and Bosworth reveal.

"I hope everyone enjoys watching it as much as we did making it," Bosworth says.