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She might be just 17 years old but Kylie Jenner has amassed more than 21 million followers on social media site Instagram - more than any other A-list minor.

That's nine million less than big sister, and social media addict Kim, 34, and 15 million MORE than her mother Kris Jenner, 59.

But while the youngest Kardashian has no shortage of fans, she does have competition in the shape of other celebrity children, among them Brooklyn Beckham and Jayden Smith, both 16.