Washington, 37, said that she is feeling blissful after her daughter's arrival, reported FemaleFirst.
"So tricky because you know I don't talk about this stuff. But I will say I feel really, really blessed. I just feel really blessed that I'm kind of living extraordinary dreams come true in my work life and in my personal life," said the actress.
The star triggered speculations regarding her pregnancy in January's Golden Globe Awards, where she sported a large baby bump.
However, Washington remained silent on the birth of baby Isabelle, with details only emerging weeks after she was born, but the actress acknowledged fans' Mother's Day well-wishes last month.