Mila Kunis and Ashton Kutcher to wed - reports

Mila Kunis and Ashton Kutcher are expecting their first child together, reports say. Photo/AP

Hollywood couple Mila Kunis and Ashton Kutcher are engaged to be married, according to reports.

Kunis fuelled speculation that she is to wed her lover of approximately two years when photos of her sporting a huge diamond ring in Los Angeles appeared on the US Weekly and E! entertainment news websites.

A source confirmed the rumours to US Weekly, adding: "She is crazy about him!"

The Black Swan actress, 30, was at The Grove shopping centre in LA when the pictures were taken.

She was previously the long-term girlfriend of Home Alone actor Macaulay Culkin.

Kutcher, 36, whose divorce to actress Demi Moore was finalised in November last year, currently appears in US sitcom Two and a Half Men

The pair first met while starring as Jackie and Kelso in television sitcom That '70s Show, in which they had an on-screen romance.

Rumours began circulating that they were a real-life couple in April, 2012 and they confirmed their romance the following year

On Friday, Kunis uploaded a photo of the pair kissing to her Instagram account, with the caption "Happily ever after..." .

The pair have neither confirmed nor denied the reports.