Ashton Kutcher has totally Punk'd fiancée Mila Kunis by impregnating her with his child, E! News reports. The elaborate 9-month-long prank will end with Kunis giving birth to an actual human person and then caring for it until adulthood. Hilarious!

The That '70s Show costars announced their engagement late last month after dating for nearly two years.

E! got the pregnancy news from an unnamed source, and also reports Mila has been spotted at a prenatal yoga class. The couple is expecting just one baby, despite the standard tabloid rumors about twins.

[Photo Credit: AP Images]