Kendall and Kylie Jenner are thought to have earned six-figure salaries from a nail polish line with OPI.
The reality star sisters lent their name to a new line of OPI products called Kardashian Kolors when Kendall was 15 and Kylie was 13.
Documents obtained by RadarOnline.com, which were filed in a Los Angeles Court, state the siblings each earned six-figure payments from the deal in 2012. Their sisters Khloé, Kim and Kourtney also promoted the line and raked in the same amount.
The girls' mother Kris Jenner's signature is on the documents and the contract reads that each sister would be allowed "up to 100 of each colour of the products for the celebrities to use for personal consumption or giveaway."
Despite Kendall and Kylie being less in the spotlight at the time, all five sisters and their mother shared the payments between them and split the profits evenly.
With Kris taking the reins in this venture her daughters are said to have had "no approval rights over the colour or name of the Product". OPI instead promised to "provide copies of all materials for which it seeks approval to Kris Jenner" to "approve or disapprove all materials on [the girls'] behalf."
While the 57-year-old businesswoman attended behind-the-scenes events the rest of the family were simply required to appear at a press day, take part in an official photoshoot and promote the nail polishes via their social-networking sites.
Kendall and Kylie also have their own clothing for website PacSun. The sisters' fun designs include Aztec crop tops and skirts, high-waisted denim shorts and tank tops all to reflect their own style and clothing choices.
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