Ashton Kutcher Mila Kunis engaged! Of course, if one is to go by the huge diamond sparkler that the actress sported on her ring finger while spotted shopping with her mother at the Grove outdoor mall.

The big chunk of diamond set the rumor mills churning fresh reports on the highly publicized romance of That 70s Show co-stars who played the on-screen characters of Jackie and Kelso. Though there has been no official confirmation on the engagement news, media sources are putting two and two together, courtesy the ring.

A day before on Wednesday, the 'Black Swan' actress shared an Instagram snap of her and Kutcher posing together, both smiling fondly and at ease with each other. She had also recently planned a birthday surprise and dinner for her beau for his 36^th birthday.

According to E! News, the 'Two and a Half Men' star may tie the knot in 2014, now that his divorce with Demi Moore has been finalized. Kutcher and Kunis had started dating early on but kept their relationship a secret until last year.

They revealed their love affair in November, 2013, after his divorce from his first wife was finalized. The two of them have been going steady for a long time and recently, there were baby rumors which did not turn into anything substantial.

Meanwhile, Ashton Kutcher's ex-wife Demi Moore has been on a romance spree, dating men younger to her. The latest man to join her string of toy-boys is Alex Pettyfer, who was seen 'flirting up a storm' with the 51-year old at a nightclub in Los Angeles.

Prior to her link-up with the 'Magic Mike' actor, the 'Striptease' actress was spotted with 'Dead Sarah' drummer Sean Friday. The two of them were introduced by Moore's daughter Rumer Willis and had hit it instantly.