Kendall Jenner is growing up so fast!

Kris and Bruce Jenner's 15-year-old daughter, an aspiring model, is already taking birth control pills.

When a recent promo for the new season of Keeping Up With the Kardashians showed Bruce freaking out when he found the pills, Jenner's half-sis, Khloe Kardashian, was quick to come to her defense.

"She is on birth control, but...I don't want it to be bad. Because it's not that reason why she's on birth control," Kardashian told E! News, presumably hinting that Jenner is on the medication to treat acne or menstrual cramps.

Tell Us: Is Kendall too young to be on birth control?

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Is Kendall Jenner, 15, Too Young to Be on Birth Control?

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Is Kendall Jenner, 15, Too Young to Be on Birth Control?