Ashton Kutcher is reportedly being extra protective of his pregnant fiancee Mila Kunis.

The 'A Lot Like Love' star has been warning people not to stress out his future wife, who is expecting her first child in October, because he is worried that their unborn baby could be affected by added tensions, reported Contactmusic.

"Ashton is tense and always yelling, not only at photographers who get near Mila, but even at their friends who visit, telling them they're making too much noise.

"Mila keeps assuring him she's fine and doesn't need special treatment or peace and quiet, but Ashton acts like he's already pacing the maternity ward floors, even though she's not due for many weeks," a source said.