"Sophie Turner and Joe Jonas are delighted to announce the birth of their baby," the couple announced in a statement.
Jonas, 30, and Turner, 24, got married in May 2019 in a private ceremony in Las Vegas. Two months later, the pair exchanged vows during a larger celebration in France.
In a recent interview on SiriusXM, Jonas said he and Turner were "having a good time" while remaining out of the public eye over the last few months.
"We got married last year, so we're still enjoying that time," the singer added.
While the "Game of Thrones" actress spent much of her pregnancy in self-isolation due to the coronavirus pandemic, the couple stepped out in June to participate in protests supporting Black Lives Matter causes.
The couple has not released any further details about the child's birth.