Few years before starring in the famous reality TV series "", Kourtney was cast on the failed show "Filthy Rich: Cattle Drive" (2005). She, moreover, also had appeared on the E! Network series "The Simple Life". By the time she and the Kardashian clan appeared on "Keeping up with the Kardashians" in 2007, they family rose to stardom and continued starring on its several spin offs, including "" and "".
Expanding her career beyond reality TV, Kourtney ran her own business. She teamed up with her sisters Kim and Khloe, running a clothing line dubbed "Dash" and releasing a jewelry line. Besides, she and her mother also co-own a children's boutique, Smooch. Additionally, the sisters created a sunless tanner called Kardashian Glamour Tan in 2010. In the same year, the threesome released a book titled "Kardashian Konfidential".