(FROM PEOPLE) ? With Brad Pitt at her side, Angelina Jolie gave birth to a son and daughter Saturday (July 12) at the Fondation Lenval hospital in Nice, France. Knox Leone weighed 5.03 pounds and Vivienne Marcheline weighed 5 pounds. Both were delivered by C-section “for medical reasons,” the doctor told the Associated Press, so that the babies could be born ”in the best conditions.” The twins are the fifth and sixth children for the couple, who are already parents to Maddox, 6; Pax, 4; Zahara, 3; and Shiloh, 2. (