Originally appeared on E! Online .

Kendall Jenner is done keeping this secret.

The supermodel admitted that she was "jealous" of her younger sister Kylie Jenner during childhood because their parents, Kris Jenner and Caitlyn Jenner , were less strict on the Kylie Cosmetics mogul.

While recounting all their teenage antics, Kylie revealed that she had often smoked weed with friends at their parents' Hidden Hills home , where much of " Keeping Up With the Kardashians " was filmed.

"Kylie had smoked weed before me," Kendall shared on the Oct. 30 episode of " The Kardashians ." "I was so mad at her. I was like, 'You're a degenerate!'"

However, the 29-year-old explained the likely cause behind her anger, saying in a confessional, "I was jealous. I was jealous that I didn’t ha

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