Mila Kunis and Ashton Kutcher are engaged according to reports this morning. E! News has exclusively confirmed that the star couple, who are known for keeping their relationship under wraps, are set to tie the knot. A source is said to have verified the news shortly after Mila was spotted wearing a large diamond ring on her ring finger during a shopping trip in Los Angeles on Thursday afternoon. The former That '70s Show co-stars started dating in 2012. Rumours have been rife for months that they were going to get engaged following Ashton’s divorce from Demi Moore.