Kourtney Kardashian net worth: Kourtney Kardashian is an American reality television star who has net worth of $25 million. Kourtney is best known for her appearances on the hit television series, Keeping Up With The Kardashians, but in recent years the Kardashian sisters, Kim, Kourtney and Khloe have been able to parlay their television success into an expanding commercial empire that has made them quite wealthy. While the bulk of Kim, Khloe and Kourtney's wealth comes from their reality duties, they have also been pulling down major cash from endorsements. Kourtney was born in Los Angeles, California on April 18, 1979. She has two younger sisters Kim and Khloé, and a younger brother Rob. She also has two half sisters, Kendall and Kylie. Kourtney first became known to reality-television audiences on the 2004 series, Filthy Rich: Cattle Drive, on which she earned money for charity. In February 2007, a sex tape made by her sister Kim and Kim's former boyfriend Ray J in 2003 was leaked, which largely contributed to her rise in popularity. Later that year, Kourtney and her family were commissioned to star in the reality television series Keeping Up with the Kardashians. The series proved successful for E!, the network on which it is broadcast, and lead to several spin-offs, including Kourtney and Khloé Take Miami, Khloé & Lamar, and Kourtney and Kim Take New York. Kourtney began dating Scott Disick in 2006, when they met at friend Joe Francis's house party in Mexico. The couple have had an on-again, off-again relationship, all throughout the filming of the show. Kourtney gave birth to their first son, Mason Dash Disick, on December 14, 2009. Mason's birth was filmed and aired during the 4th season of Keeping Up with the Kardashians. On July 8, 2012, Kourtney gave birth to their second child, daughter Penelope Scotland Disick and on December 14, 2014 to their third child, a son, Reign Aston Disick, on Mason's 5th birthday.