Jess Weixler is a new mom.
Weixler introduced Beatrice in a photo at home. The picture shows the star holding the infant in bed as Brocklebank snoozes next to her.
"Welcome to the world Beatrice Danger Brocklebank. I mean..." she wrote, adding heart and rocket emojis.
Weixler had announced her pregnancy in an Instagram post in November.
"My friends... ugh my friends they threw me the most gorgeous/adorable baby shower. Epic cuteness, safari themed and all," the star said at the time.
Weixler and Brocklebank married in December 2015. Chastain, who was roommates with Weixler at The Juilliard School, was among the guests at the wedding.
"You are the most beautiful friend. Im so proud of you."
Weixler played Robyn Burdine on "The Good Wife," which ended in 2016 after a seven-season run on CBS.
She portrays Sally McCullough on "The Son" and will star in "It: Chapter Two."