Knox and Vivienne Jolie-Pitt's Third Birthday

It was three years ago today that Angelina Jolie and Brad Pitt welcomed twins Knox and Vivienne at a hospital in Southern France. Their family instantly went from a six-some to a group of eight, but that didn't slow the Jolie-Pitts down. They've continued traveling around the world together, from the US, to Malta, and beyond — click through to see Knox and Vivienne's first 36 months in photos!

WireImage, Flynet, and INFDaily.com