In the offbeat romantic comedy Adam, Brit actor Hugh Dancy plays a man with Asperger’s Syndrome who begins an awkward courtship with his upstairs neighbor (Rose Byrne). Dancy and his real-life significant other, fiancé Claire Danes, however, are the picture of elegance. At a Cinema Society screening of the film last night, Danes stunned in a strapless white Zac Posen gown adorned with an eye-catching metallic belt (Posen also turned out for the screening).