The actress welcomed a son with her long-term boyfriend Tom just before the end of March.
She told The Sun newspaper: "We've had a lovely, healthy baby boy. He arrived just before my 40th birthday, which was the best present."
No other details have been given, including the name of their son.
Emma, who plays Charity Dingle in the ITV soap, kept her pregnancy a secret for eight months.
She hid her baby news until her character's on-screen exit, as it would blow cover on Charity's surprise plot, which saw her sentenced to two years in prison.
Emma, who has been dating businessman Tom for two years, revealed in January that the pair were "running around the kitchen" after finding out they were expecting.
"I was screaming because I was so excited," she told The Sun. "It was great. My life feels really good at the moment - it's all fallen into place."
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