Mila Kunis keeps mum on wedding rumours

Los Angeles - Mila Kunis has refused to confirm or deny whether she has married Ashton Kutcher.

The 31-year-old actress, who's been dating her former That 70s Show co-star since 2012, remained coy while she was quizzed on her marital status, trying not be drawn on speculation she and the 36-year-old actor have tied the knot.

During an appearance on The Ellen DeGeneres Show on Tuesday, host Ellen cited a recent photograph - in which the couple wrote, 'Happy New Year, (heart symbol) the Kutchers' - and observed: "It says, 'The Kutchers', so it sounds like you're married."

However, Mila - who gave birth to their daughter Wyatt Isabelle in October last year - replied: "I don't know. We could just be a plural. My daughter has his last name legally."

Ellen persisted with the marriage-related questions, asking: "Why would it be such a secret if you were married? Are you still trying to stay on the market for men? It's a whole professional thing."

Mila responded with good humour, saying: "You got it figured out, Ellen."

Mila also praised Ashton's parenting skills, admitting he's responsible for changing diapers and is "an amazing dad".

She shared: "So his whole thing is changing diapers ... the second she was born he changed the first diaper, and has changed multiple diapers ever since. If he's home he changes the diaper. He also became a master swaddler."

"He is an amazing dad. I wouldn't have done this by myself. He is 100 percent present."