The couple, who initially denied being together before being seen in a number of romantic trysts, enjoyed a visit to the city while the 'Black Swan' actress is in the Italian capital shooting 'The Third Person', reported Daily Mail.
They also enjoyed a calorific dessert composed of pastry, ice cream and berries.
Kutcher, 34, and Kunis, 29, who first worked together on 'That 70s Show', have also recently enjoyed trips to Australia and Japan following the demise of his marriage to Demi Moore in 2011.