Ashton Kutcher and Mila Kunis are desperate to have another baby.

The couple, who have eight-month-old daughter Wyatt, reportedly want all of their children to be close in age and are hoping to announce the 'Black Swan' actress' second pregnancy by the end of the summer.

A source close to the duo said: ''They both agreed they want back-to-back babies and would love to be able to announce a pregnancy by the end of this summer.

''Their daughter has brought so much joy to their lives that having another child is their main priority.

''Mila knows it will double the workload, but she doesn't need any convincing.''

Ashton, 37, has a twin brother, Michael, and hopes his former on-screen co-star might wind up expecting two babies.

The insider told Life & Style magazine: ''He's secretly hoping Mila will get pregnant with twins.''

The former 'Two and a Half Men' star previously praised the brunette beauty's parenting skills, describing her as the ''greatest'' mother.

He said: ''The most amazing part about having a baby is my partner, Mila. She's the greatest mom.''