The two stars are rumored to be an item after they were spotted on a recent three-day getaway.
According to Us Weekly, the pair fled town and drove to Carpinteria, California last Thursday.
“Ashton hung out with his hands in his pockets as Mila shopped,” a witness told the mag.
Kutcher, 34, and Kunis, 28, reportedly grabbed lunch at Sushi Teri, shopped for fruit and sunflowers and spent time in private.
“It’s a case of Ashton out and about with a really great friend,” an insider told Hollywood Life. “He really trusts Mila from their past at That 70′s Show, and they both have recently dealt with huge relationships that have broken.”
According to a source cited by People, Ashton has long been enamored with his That ’70s Show co-star.
“He was so in love with her for a while when they worked together,” the source says. “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,” the insider adds.
However, another source claims that the actor isn’t looking to start a relationship right now: “He always talked about Mila like a little sister. They’re definitely close pals and have been. I think if anything she’s a good time for him. But he’s not looking for anything serious.”
Ashton broke up with wife Demi Moore in November after a cheating scandal broke out while Mila ended her 8-year relationship with Macaulay Culkin in January 2011.