Ashton Kutcher and Mila Kunis 'discussing marriage'

Ashton Kutcher and Mila Kunis are reportedly thinking about tying the knot.

The duo's former co-star, Laura Prepon, told the confidential that the two have gotten very serious since Kutcher's divorce from Moore, the New York Daily News reported.

Prepon added that she would be a bridesmaid at the wedding.