The couple welcomed their first child on Tuesday at Cedars-Sinai Medical Center in Los Angeles, reported E! Online.
The 36-year-old actor posted snaps of eight kids on his website and asked the fans to guess, who Wyatt is among them.
"Mila and I would like to welcome Wyatt Isabelle Kutcher to the world. May your life be filled with wonder, love, laughter, health, happiness, curiosity, and privacy. Can you guess which one is ours, or does it really matter? All babies are cute," he posted.
Kutcher also joked about people spying on the couple.
Kutcher started dating his 31-year-old 'That '70s Show' co-star after finalising his divorce from actress Demi Moore in December 2013.
Kunis recently told W Magazine that she plans to take a year off of acting to become a full-time mother.
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