It's not surprising how vain these girls can get. Kendall Jenner invades Instagram by posting a series of bikini pictures on her account.

When it comes to vanity and over posting on photo sharing sites like Instagram, Kim is definitely on top of her game. But her younger sister is surely catching up.

Kendall is no stranger to cameras since most of their everyday life is documented by paparazzi, not to mention their family reality show, "Keeping Up With The Kardashians."

The 16-year-old recently posted a striking picture of herself wearing black bikinis. She peers over her shoulders and gazes straight to the camera. She put a caption with the photo that says, "all natural."

It seems like the younger sister of Kim Kardashian is making the most of her school holiday or she's probably in the middle of a modeling project. Kendall together with her sister Kylie are currently on the cover of "Seventeen" magazine.

Kylie just turned 15 over the weekend and they definitely look so much older than their actual age. Probably because of all the make up and the exposure from show business. Kendall and Kylie are growing faster than they are supposed to.

See more of Kendall Jenner as she flaunts her svelte body in teeny tiny bikinis.

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