Nov. 22 (UPI) -- Riviera star Julia Stiles is a first-time mom.
The 36-year-old actress announced in an Instagram post Tuesday that she welcomed her first child, son Strummer Newcomb, with husband Preston J. Cook in October.
"Strummer Newcomb Cook, born October 20, 2017," Stiles captioned a photo of her baby boy holding onto Cook's thumb.
"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 added.
Stiles had confirmed in June that she was expecting with Cook, an actor and camera assistant. She and Cook tied the knot over Labor Day weekend in September at a beach wedding in Seattle.
"Who doesn't love a shotgun wedding?" the star captioned a picture of herself and Cook in their wedding attire.
Stiles is known for playing Nicky Parsons in the Bourne movies, and most recently appeared in Jason Bourne. She also portrays Georgina Clios on Riviera, which was renewed for a second season on Sky Atlantic this month.