The couple are reportedly getting married

Mila Kunis has fuelled speculation that she’s set to marry Ashton Kutcher.

The actress, 30, happily showed off a huge diamond ring on her finger as she shopped with her mum in LA on Thursday.

And while the couple haven’t yet commented on the rumours, sources say that they’ve been thinking of getting hitched for a long time.

Ashton and Mila have talked about getting married for quite a while,’ the insider tells People.

Another friend of Ashton’s adds: They’re incredibly happy together.’

Mila has been dating Ashton, 36, for two years following his split from ex-wife Demi Moore in 2011.

But they’ve known each other for many years, having starred in the sitcom That ’70s Show together from 1998 to 2006.

SEE PICTURES Ashton Kutcher in celebrities wearing bandanas

SEE PICTURES Ashton Kutcher gives a speech at the GQ Gentlemen’s Ball in New York

SEE PICTURES Ashton Kutcher at the Valentine’s Day London premiere

Anna Francis