Kate Bosworth for Big Sur Sundance Film Festival Pictures

Kate Bosworth and her fiancé Michael Polish premiered and promoted the film that brought them together, Big Sur, at the Sundance Film Festival on Tuesday. Michael directed the movie, which is an adaptation of Jack Keroauc's book of the same name, and Kate stars in it as one of Jack's lovers. Kate and Michael met while making Big Sur, and the actress revealed that she fell in love with Michael first as a director before their romantic relationship started. Kate also celebrated her 30th birthday in early January and spoke to press about taking on more mature roles like this one as she enters the next big decade of her life and career.

We're on the scene at the Sundance Film Festival, so follow POPSUGAR on Instagram for all our behind-the-scenes pictures!