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.
The singer and former America's Got Talent host welcomed twins Moroccan Scott Cannon (aka "Roc") and Monroe Cannon (aka "Roe") on the couple's third wedding anniversary, April 30, 2011.
Their son is reportedly named after the famous Moroccan Room in Mariah's lavish NYC apartment. His middle name, Scott, is Nick's middle name as well as his mother's maiden name. Monroe was named after Marilyn Monroe, who Mariah has publicly called her inspiration.
After marrying longtime friend Marc in 2004, J.Lo gave birth to twins Maximilian David Muñiz and Emme Maribel Muñiz on Feb. 22, 2008.
The twins made their public debut in a March 2008 issue of People, for which the magazine paid a reported $6 million. The coveted photos of the twins became the most expensive celebrity picture ever taken at the time.