Mila Kunis and Ashton Kutcher are officially parents!

The engaged couple and former That '70s Show co-stars have welcomed a baby girl, a source confirms to E! News.

Their daughter arrived early Wednesday morning at Los Angeles' Cedars-Sinai Medical Center.

The two were most recently spotted walking their dog on an afternoon hike near their home in Los Angeles on Sept. 27, with a very pregnant Kunis holding hands with her husband-to-be.

And earlier this month, Kutcher revealed on Twitter that he was anxiously awaiting the arrival of his little girl, saying, "Nervous is excited's victim sister."

In the days and weeks leading up to the birth, Kunis had been spending some extra one-on-one time with her fiancé.

From late-night dinner dates to afternoon trips at the dog park, the couple truly savored the final weeks of pregnancy.

"Ashton is not letting Mila out of sight. They are spending every moment together," a source told E! News shortly before the brunette beauty gave birth. "He can't wait."