The duo first worked together on That ‘70s Show and formed a romantic relationship after leaving the sitcom. Now they are engaged and thought to be expecting their first child, the couple seemingly use their own union as material for laughs on the hit American comedy programme.
"I bet you only date hot actresses," she tells his character in the episode which debuts April 21 at 8pm on Comedy Central. The line prompts him to respond: "God no, I'd never date an actress. They're all crazy."
Before seeing 30-year-old Mila, Ashton, 36, was married to actress Demi Moore, and their divorce was only finalised recently. Two fresh teaser clips have been released before the instalment is finally shown to fans of the show – which previously starred Charlie Sheen – and in one snippet, Ashton claims all women who act for a living have mental issues.
"I'm sure they're not all crazy," Mila quips, before he replies, "Trust me, they are".
Watch the first clip below:
Mila’s character is sharing fast-food with Ashton’s Walden Schmidt at the time and snaps back: "Who cares who's dating whom, or who's engaged to who, or who has a sex tape that no one will ever, ever see!"
Mila plays Vivian, "a young, beautiful, free-spirited world traveller".
She gets romantic with Ashton's character, Walden, however he was planning to propose to someone else before she came along. Multiple sources have confirmed that the actress is expecting her first child with her fiancé. The exciting news comes one month after the couple's engagement was revealed.
The duo are expecting a child in real life
Watch the second video below: