Joanna also shared further details on her account.
"Blainey Ann Burgess. Our precious girl entered the world on 28.7.19 (on her due date 👏🏻)💗💗So blessed, so in love and in a total newborn love bubble 💗" Jo wrote.
George and Jo are also parents to two-year-old son Boston, and 11-month-old daughter Birdie.
The exciting new addition to the Burgess family comes as George announced he is set to leave NRL club Rabbitohs to move to his native UK on a deal with Wigan Warriors, which will start in 2020.
The rugby league player will part ways with brothers Sam and Tom after agreeing a three-year contract with the Warriors.
