The 37-year-old actress managed to keep the news secret until now. TMZ revealed Friday that Washington gave birth to daughter Isabella Amarachi on April 21.
Washington had debuted her baby bump at the 2014 Golden Globe Awards.
"I have the best date of the night," she told reporters as she held her belly. "My little accessory."
The star currently portrays crisis manager Olivia Pope on Scandal. The series just finished its third season on ABC.
Notable deaths of 2014 [PHOTOS]
Brantley Gilbert engaged to 'hometown girl'