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Kourtney Mary Kardashian (born April 18, 1979) is an American television personality, socialite, businesswoman and model. In 2007, she and her family were picked to star in the reality television series Keeping Up with the Kardashians. Its success led to the creation of spin-offs including Kourtney and Khloé Take Miami and Kourtney and Kim Take New York.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.