A source revealed exclusively to Life & Style that the couple is "super excited" to be welcoming not one, but two little bundles of joy later this year.
“They’re both so happy,” says the insider, “and love the idea of giving Wyatt two baby siblings.”
Ashton, 38, is already preparing for the double arrival by buying sets of everything, including LA Dodgers baseball caps.
"He would love to have two boys, or a boy and a girl,” the source explains.
However, the baby news didn't come as a huge surprise to the former That '70s Show co-stars, seeing as twins run in Ashton's family and he has a fraternal twin brother named Michael.
For more celebrity baby news, pick up the latest issue of Life & Style magazine, on newsstands now!
For a look at Ashton and Mila's cutest moments, check out the gallery below!