The "Black Swan" starlet has been dating her former "That '70s Show" co-star Ashton Kutcher since April.
The Huffington Post said she recently sparked baby buzz when she was photographed in Los Angeles wearing a loose-fitting tank top.
But Kunis' publicist is shooting down the speculation.
"She is not pregnant," Kunis' representative told RumorFix, separately clarifying to the MailOnline, "She is not expecting."
Celebrity Families of 2014 [PHOTOS]