On Monday night, a representative for the couple confirmed that Sophie had given birth to a baby girl and that she and Joe were "delighted" with their new arrival.
TMZ went on to report that Sophie gave birth in LA on Wednesday July 22, and that she and Joe have named their daughter Willa.
Of course, Sophie is best known for her role as Sansa Stark in Game of Thrones, and the pair have spent a lot of their relationship bonding over their love of the show.
And after hearing the reported name, fans were quick to make a connection between it and the show.
In fact, there were actually two Willas on Game of Thrones.
And while the appearances of both Willas were pretty fleeting in the show, people were quick to point out the connection.
Whether or not the pair got inspiration from Game of Thrones when deciding their daughter's name remains unclear, but the traditional meanings behind the moniker are "resolute", "protector", and "defender", which is pretty badass in itself.