It is the Marvel star and Schwarzenegger’s first child together.
Her name is Lyla Maria Schwarzenegger Pratt.
Pratt posted a photo on Instagram of the couple’s hands wrapped around a baby hand, captioning it with a message and two Bible verses.
“We are beyond thrilled to announce the birth of our daughter, Lyla Maria Schwarzenegger Pratt. We couldn’t be happier. Both mom and baby are doing great. We are extremely blessed,” he wrote.
He added two Psalms, one saying “we are filled with joy,” and another about being blessed.
Pratt is also the father of a 7-year-old son, Jack, with ex-wife Anna Faris.
The “Avengers” star and Schwarzenegger married in June 2019 after a six-month engagement.