See Mila Kunis guest star with Ashton Kutcher on 'Two and a Half Men'

Mila Kunis' real-life romance with Ashton Kutcher crossed over into TV territory on Thursday night.

The actress made her guest appearance on Kutcher's CBS sitcom "Two and a Half Men," playing a part that didn't require a stretch: his love interest.

In the episode, Kutcher's character Walden feels an instant attraction to Kunis' Vivian, "a young, beautiful, free-spirited world traveler." The only problem? Walden's been planning to propose to someone else.

"Two and a Half Men's" writers had a field day with Kutcher and Kunis actual relationship, dropping inside jokes about their celebrity status and past roles extensively throughout the show. (Kutcher, 36, and Kunis, 30, are engaged and expecting a baby.)

Whether you were entertained by their pairing probably depends greatly on whether you're a fan of "Two and a Half Men" to begin with, but it's nonetheless a sweet callback to Kutcher and Kunis' days of playing an on-again, off-again couple on "That '70s Show."