These stars had more than one kid...at the same time!
Click through the gallery to see celebrity couples — including Mariah Carey, Jennifer Lopez and more — who have twins!
Knox Léon and Vivienne Marcheline Jolie-Pitt were born on July 12, 2008, in Nice, France and instantly became the most famous celebrity children in the world.
The now nine-year-old twins are Brad and Angelina's fifth and sixth children — the couple is also parents to sons Maddox Chivan, 16, and Pax Thien, 13, and daughters Zahara Marley, 12, and Shiloh Nouvel, 11.
The rights for the first images of Knox and Vivienne were jointly sold for a reported $14 million — knocking the photos of Jennifer Lopez and Marc Anthony's twins down the totem pole for the most expensive celebrity pictures ever taken. The proceeds were donated to the Jolie-Pitt Foundation.