She joins brother Benjamin Rein, who turns 3 on Saturday (Dec. 8) Brady also has a son John, 5, with actress Bridget Moynahan.
Bündchen and Brady, 35, were married in February 2009.
“We feel so lucky to have been able to experience the miracle of birth once again and are forever grateful for the opportunity to be the parents of another little angel,” Bündchen, 32, said in a statement.
Vivian was born at home in Boston. “She is healthy and full of life. Thank you all for your support and well wishes. We wish you and your families many blessings,” the supermodel said.
When the Brazilian beauty had her first baby she barely looked pregnant and appeared to have kept her baby weight to a minimum. She was spotted around Boston and New York when her due date was a month away. This time around it was the same.
The public only discovered she was pregnant when her baby bump became impossible to hide. .
Brady had jokingly told friends that she could have the baby on any day but Sunday. The Patriots are in the Superbowl hunt again this year.