The couple has reportedly named their new-born Willa.
“Sophie Turner and Joe Jonas are delighted to announce the birth of their baby,” they said in a statement released through his label Republic Records.
Sophie Turner-Joe Jonas
However, international website TMZ, who was the first to report the news, stated the couple welcomed a girl named Willa on Wednesday, 22 July, at a Los Angeles-area hospital.
Sophie Turner with Priyanka Chopra
The 24-year-old actress married Joe Jonas last year and the duo is said to be on cloud nine ever since the arrival of their daughter.
Sophie & Joe tied the knot twice, last year - once in May, followed by a larger ceremony in June, they also purchased a baby-friendly home in Los Angeles together over the holidays.