Mila Kunis insists she doesn't mind working while she's pregnant.

The 'Third Person' actress - who is expecting her first child with fiancé Ashton Kutcher in October - is currently promoting the new movie, but admits it will probably be harder to manage everything once their baby is born.

Asked if it's difficult for her to be doing interviews and attending red carpet events, the 30-year-old actress told US chat show host Jimmy Kimmel: ''It's fine. It's really fine.''

The 'Jimmy Kimmel Live!' presenter, who is also expecting his first child with wife Molly McNearney, predicted things will be tougher to juggle when Mila and Ashton's baby arrives, and she replied: ''Yeah.''

The brunette beauty then poked fun at Jimmy, Ashton and other fathers-to-be by spoofing a public service announcement, warning men never to say they're pregnant too.

When Jimmy said: ''We are having a baby very soon, as well.''

The 'Black Swan' star sarcastically asked: ''Oh, you're both having a baby? You and your wife are pregnant?''

She then jumped out of her seat, grabbed a microphone and said: ''Hi. I'm Mila Kunis, with a very special message for all you soon-to-be fathers. Stop saying 'we're pregnant.' You're not pregnant! Do you have to squeeze a watermelon-sized person out of your lady-hole? No.''

She also lamented the fact she couldn't drink tequila, before being joined by a group of pregnant women holding tubs of chocolate ice-cream at the end of the sketch, and added: ''You're not pregnant. We are.''