1:52
While this is Schwarzenegger's first time as a mother, Pratt is already father to son Jack, who will be 8 later this month, whom he shares with ex-wife Anna Faris.
News first broke in April that the couple, who started dating in June 2018 and married a year later, had a baby on the way.
Though the pair kept relatively quiet throughout the pregnancy, Pratt took to Instagram on Aug. 1 to share a photo of Schwarzenegger. With her baby bump on display on a hike, he wrote that she was \"ready to pop.\"
For her part, Schwarzenegger told \"Good Morning America\" in July her parents, Arnold Schwarzenegger and Maria Shriver, had been \"amazing\" during her pregnancy.
\"I am always lucky to be able to have what I feel are the world's most supportive parents and also best parents,\" she said at the time.
Schwarzenegger also said the \"Terminator\" actor, 73, and the journalist, 64, were \"excited\" to meet their first grandchild.
Additionally, Schwarzenegger said she hoped \"to be able to learn from them\" as she embarked on this new journey.
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