This will be the second child for Dewan, who shares 6-year-old daughter Everly with Channing Tatum, and the first for Kazee.
The actress and her beau, who won a Tony for his work in the Broadway production of "Once", made their relationship official back in April, but have been linked since October of 2018.
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Dewan and Tatum announced their split in April 2018 after nine years of marriage with a joint statement on Instagram.
"We have lovingly chosen to separate as a couple," the statement read. "We fell deeply in love so many years ago and have had a magical journey together. Absolutely nothing has changed about how much we love one another, but love is a beautiful adventure that is taking us on different paths for now. There are no secrets nor salacious events at the root of our decision — just two best friends realizing it's time to take some space and help each other live the most joyous, fulfilled lives as possible."