Fan reactions to Penelope Disick's mature photo of Kourtney Kardashian

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The Kardashians have been followed by fans for many years,

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yet it may be difficult to see how the kids are developing.

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On Thursday, Kourtney Kardashian, 43, shocked Instagram fans by posting pictures daughter Penelope Disick, 10, in costume.

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The young girl wore a pink dress with spaghetti straps and a square neckline.

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She framed her gorgeous face with straight, down-do hair that was her natural colour.

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Reign Disick, 7, looked dapper in dark overalls and a graphic T-shirt.

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He is Poosh's younger brother. He was also grinning.

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P seems so mature, "Under a 10-slide carousel from the launch party for Kardashian's Lemme, one user remarked.

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Someone cried out, "That's Penelope, omg.

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