The 'Scandal' star - who revealed her pregnancy last October - secretly welcomed her first child, Isabella Amarachi, with husband Nnamdi Asomugha into the world at a hospital in Los Angeles on April 21, according to gossip website TMZ.com.
A source also told PEOPLE.com: "Kerry is at home with the baby."
Nnamdi, 32, signed the birth certificate more than a week after the birth.
The 37-year-old actress married the former San Francisco 49ers in a secret ceremony last July and previously admitted she was thrilled to be expecting their first baby.
She said: "I feel really, really blessed. It just feels like a really good time."