Kutcher, 36, and Kunis, had already made news this weekend when the duo was caught on the Kiss Cam at a Los Angeles Clippers game Saturday night, where they shared a little peck on the lips for a cheering audience.
News of the That '70s Show couple's engagement broke at the end of February when Kunis was seen shopping at The Grove in West Hollywood while wearing a huge diamond ring.
Prior to baby news and engagements, Kunis and Kutcher were both in high-profile relationships. Kunis dated Home Alone actor Macaulay Culkin for nearly nine years, while Kutcher was married to actress Demi Moore until their separation in November 2011. Kutcher filed for divorce in December 2012, which was finalized in November 2013.