CBS executives announced Tuesday Mila, who starred opposite real-life love interest Ashton on That ‘70s Show, will guest star in an upcoming episode of Two and a Half Men.

According to The Wrap, the actress will play a “free-spirited world traveller” named Vivian, who wins over Ashton’s character Walden just before his proposal to another woman.

Ashton and Mila previously played boyfriend and girlfriend on their earlier period sitcom That ‘70s Show, which ran for eight seasons on Fox.

The two stars sparked speculation they had begun a romance in 2012 during Ashton’s split from ex-wife Demi Moore.

The former couple finalised their divorce in November 2013, shortly after his relationship with Mila was confirmed, and it appears they couldn’t be happier.

Mila and Ashton sparked engagement rumours last month after she was seen sporting a diamond ring on her wedding finger while out and about.

Sources told Us Weekly at the time Ashton had proposed.

"She is crazy about him!" the insider said of the 30-year-old actress.

Apparently Ashton, 36, went all out to ensure Mila was presented with an incredible engagement ring.

He is said to have asked a jewellery company she is ambassador for to help with the band, which was supposedly made by ethical firm Gemfields.

"He's asked designer Arpita Navlakha to create an 18-carat gold ring set among 25 rose-cut pink diamonds," a source previously told British magazine Closer.