Mila Kunis to Guest Star on 'Two and a Half Men'

CBS Netwrok have announced that Mila Kunis is to guest star in an upcoming episode of Two and A Half Men alongside her boyfriend Ashton Kutcher.

Mila will be playing an adventurous mistress who gets to meet Kutcher's character, who falls for her and decides to propose, only to find that she's involved with another man.

The couple have appeared as lovers in the period sitcom That 70's Show for eight years. News about the couple's engagement have surfaced after Mila was spotted with a diamond ring on her finger.