The Two and a Half Men star recently became the 500th passenger to sign up for the first journey on Richard Branson's Virgin Galactic spacecraft.
"Great news today, news from our Astronaut Relations team at Virgin Galactic - our 500th future astronaut customer has just signed up! Even better news is that number 500 is Ashton Kutcher," Branson wrote on his official blog on Monday.
"I gave Ashton a quick call to congratulate and welcome him. He is as thrilled as we are at the prospect of being among the first to cross the final frontier (and back!) with us and to experience the magic of space for himself. As you can see from the video, our spaceships are not only very beautiful but are built and flying in the final stages of our exhaustive test flight programme."
Branson added: "We are guided by safety and so will ensure that everything is just as safe as it can possibly be before we start commercial services - particularly as I will be on the first commercial flight with my kids!
"Ashton is joining a fast expanding group of true pioneers who are on their way to a life changing experience and a place in the history books. It's great to have him on board."
According to the Virgin Galactic website, trips to outer space with the company cost approximately $200,000 (£126,000). The date of Kutcher's journey has not yet been released.
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