Kunis, 30, got engaged to her boyfriend (and former "That '70s Show" costar) Ashton Kutcher last month. It will be the first child for both actors.
Kunis and Kutcher started dating back in 2012, following Kutcher's high-profile split from wife Demi Moore back in 2011. Their divorce was finalized last October.
E! reports that Kunis was recently spotted at a prenatal yoga class. They also say that rumors Kunis is pregnant with twins are false.
Perhaps Kunis's pregnancy explains her reduced role in the "Ted" sequel?
Photo by AP Photo/Danny Moloshok