Stiles announced that she had given birth to her first child last week, alongside a cute pic of her bundle of joy and her husband, Preston J. Cook.
"Strummer Newcomb Cook, born October 20, 2017. Thanks and ever thanks to the extraordinary Doctors, Nurses and staff at Mount Sinai for helping bring this utter joy into our lives. ❤️✨ 'Hello, World!'" she wrote.
Stiles and Cook married in September, three months after she announced her pregnancy. The pair got engaged in January 2016, after meeting when Cook was a camera assistant on her 2015 movie, Go With Me.