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Kylie Jenner and Kardashians Rule Apple’s App Store

Forget Facebook, Snapchat and Instagram. The number one app on iTunes belongs to Kylie Jenner.

Her sisters aren't too far behind. As of Wednesday, afternoon Khloé Kardashian had the number eight spot, followed by Kim Kardashian West at 11 and Kendall Jenner at 16.

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Each app provides users with personal diaries, behind-the-scenes videos, beauty tips and more for $2.99 a month. The 18-year-old Kylie Jenner celebrated her app's success with (what else?) an Instagram post.

This is not the first time the family has struck gold in the App Store. Last summer, Kim Kardashian made millions with her mobile game "Kim Kardashian: Hollywood."

It helps to have a massive social media following when pushing your app. Kylie has 35.9 million followers on Instagram, which, while short of Kim's 46.2 million, is still a pretty good platform for self-promotion.

It's not clear how many people have actually downloaded the sisters' apps. NBC News reached out to Apple to find out but the company did not reply.

Not everyone who downloaded the apps will become paying subscribers — they get a seven-day trial before they have to cough up cash. But right now it seems like the Kardashian sisters are poised for a big financial win.