Mila Kunis and Ashton Kutcher want to have another baby.

The couple, who welcomed daughter Wyatt into the world late last month, are reportedly already thinking about expanding their family again.

A source told E! News: ''They are loving being new parents. Ashton is already mentioning baby number two. Mila laughs and tells him to slow down! But she wants another baby and to have it close to Wyatt's age so they can be close.''

The 31-year-old actress is ''not too stressed'' about getting her pre-pregnancy figure back, but recently started working out again.

The insider said: ''Mila has been spending a lot of time trying to lose the baby weight, which is slowly coming off. She's not too stressed about it but does want to get back into her skinny jeans. She says she has so many sizes of clothes in her closet. She has post baby sizes, maternity clothes, pre-baby sizes and then her 'Black Swan' clothes which are the smallest sizes she owns.

''She has been doing yoga, and cardio but still isn't going crazy. They enjoy bad food as well and she indulges when she wants.''

Meanwhile, the former 'That 70s Show' stars, who got engaged earlier this year, are ''super excited'' to dress Wyatt up for Halloween next Friday (31.10.14).

The source said: ''They think it's hilarious and are putting her in all kinds of baby costumes and outfits. It's their first holiday as a family and even thought Wyatt is barely a month old, they are stoked!''