Mila Kunis' daughter thinks everyone is pregnant.

Mila said she had been teaching the toddler that "mummy has a baby in her belly".

However the 'Bad Moms' star said that when she asks her daughter where the baby is, "she'll point to her belly, the garbage mans belly, everybody's belly".

But Ashton has taught his daughter that he is the exception to the rule.

The brunette beauty told 'The Tonight Show': "He taught her... 'What's inside daddy's belly?' And she goes, 'Beer.'

"Everyone else has a baby, and then what's inside papa's belly? Beer!"

While Ashton, 38, likes to have a joke with his daughter, Mila knows he'll be very hands-on and practical when the new baby arrives.

She said: "He's [Ashton] an incredible father. There's not even a question. You know some men -- and it's OK -- it takes them a little bit of time to adapt to having a baby and feel comfortable. Wyatt came out, and two seconds later he had it down. He's swaddling and changing diapers. He's incredible."

And Ashton - who was previously married to Demi Moore and acted as stepfather to her three daughters, Rumer, Scout and Tallulah, with Bruce Willis - previously described parenthood as the "greatest thing ever."

He said: "It's legitimately the greatest thing ever."