Ashton Kutcher and Mila Kunis

Ashton Kutcher and Mila Kunis

Mila Kunis and Ashton have sparked rumours they've gotten married.

The 'Black Swan' actress, who gave birth to a baby girl, Wyatt Isabelle, with the 36-year-old actor in late October, has fuelled speculation she may have recently tied the knot with her former 'That 70s Show' co-star after being spotted wearing a new platinum band below her diamond engagement ring while enjoying a rare date night with him on Friday (19.12.14).

The 31-year-old beauty made no attempt to conceal the ring as she and her fiancé watched the Los Angeles Lakers take on Oklahoma City Thunder at the Staples Centre.

The pair were also very affectionate during the basketball game and happily puckered up for the Kiss Cam, according to MailOnline.

A spokesperson for the couple, who started dating in 2012 and got engaged earlier this year, has yet to comment on the wedding rumours, but Mila previously vowed to keep their nuptials an extremely private affair.

She recently said: "I never wanted to get married. From the age of 12, I prepared my parents for no marriage. Then things changed -- I found the love of my life. Now my theory on weddings is: Don't invite anyone. Do it privately and secretly.

"My parents are okay with that. They're just excited that I said yes."

Ashton was previously married to actress Demi Moore, 52, for eight years, who he split from in November 2011 after he was accused of cheating on her.