The former That 70s Show co-stars jetted off to Bali for a romantic break their first overseas holiday since hooking up several months ago.
Waiting in line at security, Ashton put his arm around Mila while she rested her travel-weary head on his chest.
Recent images of the lovebirds kissing reportedly left Ashton's ex-wife Demi Moore "heartbroken".
"Demi is devastated that Ashton has moved on so quickly and is dating Mila," a friend told Radar Online. "She is beyond heartbroken."