Angelina Jolie and Brad Pitt by Dominique Charriau/WireImage.com Angelina Jolie and Brad Pitt by Dominique Charriau/WireImage.com

Following the birth of Vivienne Marcheline and Knox Leon, Angelina Jolie's doctor spoke to the press about what went down in the delivery room and how mom, dad and the babies are doing.

Per People, Dr. Michel Sussman joked that the during the delivery, Brad Pitt was almost like his assistant, never leaving Jolie's side. Sussman said the new dad was "perfectly calm, totally determined, very pleased to be at the birth of his children, very moved and very emotional." As for the new mom, everything went smoothly, and she's expected to stay at the Fondation Lenval Hospital in Nice for a few more days.

In the meantime, Mayor Christian Estrosi of Nice, France, on Sunday welcomed the twins, and publicly presented their birth certificates on the steps of the hospital where they had been born the night before. He told reporters, "On behalf of the inhabitants of Nice, I congratulate the happy parents, the most famous couple of the world who have chosen our city for this happy event." - Erin Fox and Anna Dimond

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