Playing Vivian, a woman who shows up on the doorstep of Walden's Malibu beachhouse, Kunis jokes, "I bet you only date hot actresses."
"God, no. I'd never date an actress. They're all crazy," her fiancé responds.
"I don't get this whole fascination with celebrities, anyway," says Kunis, who's expecting the couple's first child later this year. "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?"
The episode airs Thursday, at 9:30 p.m. ET, on CBS.