[Vivian] joins big brothers Benjamin, who turns 3 Saturday, and John, 5, Brady's son from a previous relationship.
"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," the supermodel, 32, announced on her Facebook page.
"She is healthy and full of life. Thank you all for your support and well wishes. We wish you and your families many blessings."