Kourtney was born in Los Angeles, California as the eldest of four children of Kris Jenner (née Kristen Mary Houghton) and attorney Robert Kardashian, with siblings Kim Kardashian West, Khloé Kardashian, and Rob Kardashian. Her father was of Armenian descent and her mother is of mostly English ancestry. In 1991, when she was age 12, her parents divorced and she spent her time between their separate houses in Beverly Hills. Her mother married Caitlyn Jenner, 1976 Olympic Gold Metal Champion for the Decathlon and later had two children with him, Kendall Jenner and Kylie Jenner. After the O.J. Simpson murder trial propelled Kourtney’s father, Bob, into the spotlight (he was a member of the “Dream Team” of lawyers defending the accused murderer in what journalists hail the “Trial of the Century”), her mother decided it would be safer to move her family to Hidden Hills, California.
With sisters Kim and Khloé, Kourtney is involved in the retail and fashion industries. They have launched several clothing collections and fragrances, and additionally released the book Kardashian Konfidential in 2010.
Kourtney and her siblings are popular on social media from which they derive most of their revenue by endorsing products such as waist slimming pants, beauty products, Coca-Cola and prescription drugs, for which they are paid (as of 2016) between $75,000 and $300,000 per post on Instagram, Facebook and Twitter, as per CBC Marketplace.