Kourtney Mary Kardashian was born in Los Angeles, California on April 18, 1979, to Robert Kardashian and Kris Houghton, now known worldwide as Kris Jenner. Kourtney has two younger sisters, Kim and Khloé, seen here on holiday together as children. She also has a younger brother, Rob, plus stepbrothers Burton, Brandon and Brody, stepsister Casey and half-sisters, Kendall and Kylie Jenner, from Kris’ subsequent marriage to Caitlyn Jenner.