Kutcher, 34 and Kunis, 28, took a three-day trip to Carpinteria in California where the rumoured couple were spotted eating sushi and shopping for fruits and flowers, reported Daily Mail online.
A representative for the "Black Swan" actress said the two were not dating. However a source said Kutcher used to have a crush on Kunis.
"He was so in love with her for a while when they worked together. He thought she was a goddess, was always talking about how beautiful she is. But she was with Macaulay Culkin for a lot of that time and also just generally gave off a not interested vibe. It never happened, but I'm not surprised by this at all," a source said.