At the premiere of her new film A Dangerous Method Keira left the crowd swept away as she arrived in a floor-length Valentino couture gown. The long sleeves shimmering dress boasted lace detail and golden appliqu on the flowered pattern. Keira, 26, teamed the golden gown with a simple up hair style and seductive smokey eyes. The actress is set to stun fans in the film, in which she plays a sex-starved psychiatric patient, who enjoys masochism. In the film, the actress is seen being spanked with a leather belt. She stars as Sabina Spielrein, who is admitted to a psychiatric hospital in the grip of hysteria, to be treated by renowned psychoanalyst Carl Jung. Set in the early 20th century, the film follows the pairs ensuing love affair, and her rise to medical pre-eminence, as well as Jungs well documented relationship and bitter feud with Sigmund Freud. And speaking at the festival Keira revealed that she wanted to continue starring in period films. She said: 'I do a lot of period drama. I just love them. I love everything about them. Im interested in history and it is a privilege that (playing such roles) is part of my job. Set between 1904 and 1913, A Dangerous Method tackles the struggle between Sigmund Freud (Mortensen) and Carl Jung (Fassbender) to establish their supremacy at the dawn of the era of psychoanalysis. Keiras character arrives at a Zurich hospital aged 18 to be treated by Jung. MO