OK! Investigates: Kourtney Kardashian's Net Worth And How She Made Her Fortune!

Kourtney Kardashian may lag behind her higher profile little sister Kim  in the money stakes but she still makes bank!

In the third installment of our special week long feature, OKMagazine.com is breaking down how much each member of the Kardashian family is worth, how they built their fortunes and where the money comes from—and next up is Kim and Khloe's older sibling.

Born April 18, 1979, Kourtney is the oldest of four, with sisters Kim and Khloe trailing behind her, then brother Rob. 

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Kourtney is also a half sister to Kendall and Kylie from her mom Kris' second marriage to Bruce Jenner—in addition, she has four step-siblings, brothers, Burt, Brandon and Brody and sister, Casey.

Not surprisingly, as she is a hands on mom to son Mason and daughter, Penelope, Kourtney doesn't have her finger in quite as many business pies as Kim and Khloe—that said, the 32-year-old, who lives with baby daddy, Scott Disick, still manages to keep herself pretty, pretty busy!

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Kourtney attended an all-girls Catholic school in Los Angeles then moved to Dallas Texas to attend the Southern Methodist University for two years before heading to Tuscon to study Theatre Arts at the University of Arizona.

The Kardashian name secured its place in pop culture history in February 2007 after a sex tape Kim made in 2003 with her then-boyfriend, Ray J, was leaked to the public. 

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In October of the same year E! premiered Keeping up With the Kardashians, a reality show following the day-to-day lives of the Kardashian family along with Bruce, Kylie and Kendall.

Even before her launch into the reality TV world, Kourtney was financially set for life, as her father Robert Kardashian left a whopping $100 million estate in trust for his family when he died from esophageal cancer in 2003.

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But, the mom-of-two was determined to make her own mark in life—and with three successful spin-off shows under her belt, Kourtney and Khloe Take Miami, Kourtney and Kim Take New York, and Kourtney and Kim Take Miami, she's certainly achieved her dream… and then some!

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Adding further to the coffers, Kourtney pulls in a sizable fortune from tweeting, earning up to $15,000 per message to her 8.8 million followers.

She's also rolling in it from her personal appearance and red carpet fees, getting paid up to $125,000 a time.

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Kourtney, along with Khloe and Kim, has a clothing line, Kardashian Kollection, which the sisters sell though Sears in the U.S. and Dorothy Perkins in the U.K—although the exact details of their deal are unknown, the business brought in around $250 million in sales last year, of which we are sure they received a healthy portion.

The girls also own D-A-S-H, an upscale fashion store with branches in New York, LA and Florida and a lifestyle boutique called Kardashian Khaos, which is based in the Mirage Hotel in Las Vegas.

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In addition, Kourtney and her mother opened children's clothing boutiques called Smooch—they have two branches, one in LA and one in New York.

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Then, finally, the endorsement deals:

- Quick trim weight loss

- Teeth Whitening

- Glamor Tan sunless tanner

- Perfect skin

- Tria Beauty in-home laser hair removal

- OPI nail polish

What do you think of Kourtney's net worth? Sound off in comments below and tweet us @OKMagazine