New York, Oct 13: "Fifty Shades of Grey" fame actress Dakota Johnson has sparked dating rumours with actor Jon Hamm after the two were spotted having a romantic date night at a hotel here. According to a source, Johnson was seen drinking wine with the "Mad Men" actor at a restaurant after the latter hosted the Brooklyn Black Tie Ball last week, reports pagesix.com. "They seemed to really be enjoying each other's company," the source said. Johnson and Hamm were hanging out for about two hours during the "low-key" date night, the source added. This was not the first time when the actors were caught together. In March, the stars were photographed together at singer Elton John's 70th star-studded birthday bash in Los Angeles, though they reportedly arrived separately.