Mila Kunis is pregnant.

The 30-year-old actress is expecting her first child with That 70s Show co-star Ashton Kutcher, to whom she recently got engaged. "They are both very, very happy. It's still early," a source told People.

The couple sparked engagement speculation after Mila was spotted with a huge diamond ring last month, but the loved-up stars aren't expected to rush down the aisle in light of their baby news. "It won't necessarily be a short engagement. They haven't begun planning the wedding yet," the insider added.

Meanwhile, E! News reports that Mila was recently seen at a prenatal class in Los Angeles.

The couple began dating in 2012 following Ashton's split from ex-wife Demi Moore, but they have known each other for years after playing the lead roles in hit 1990s sitcom That '70s Show.