Actors Angelina Jolie and Brad Pitt, 44, are parents again, for the fifth and sixth time! Angelina, 33, delivered fraternal twins, a boy and a girl, by c-section on Saturday, July 12th in Nice, France. Son Knox Leon weighed in at 5.3 lbs, while daughter Vivienne Marcheline was 5 lbs. Ob/gyn Dr. Michael Sussmann told PEOPLE,

The babies are doing well. The operation went just perfectly. Angelina is in very good spirits. Brad Pitt was at her side. He was there and all was well.

Dr. Sussmann explained that the date for the scheduled cesarean was moved forward "for medical reasons," citing a need for the babies to be born into "the best conditions."

The couple never formally announced the pregnancy; instead, Angelina debuted a belly at the Independent Spirit Awards. In May, rumors of twins were confirmed by an accidental slip-of-the-tongue from co-star Jack Black -- but no worries, Angelina and Brad didn't mind. The couple preferred not to share the twins' due date, and said they would keep the sexes private as well.

Knox and Vivienne join older siblings Maddox Chivan, 6 ½, Pax Thien, 4 ½,Zahara Marley, 3 ½, and Shiloh Nouvel, 2.

Source: People; Photo by Tony Barson/WireImage.