Kim Kardashian and Kanye West have just announced the birth of their fourth child.
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Kardashian says that her newborn is so far the 'chillest' of all her kids.
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Kim Kardashian used a surrogate for this baby, which was born last Thursday.
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Kardashian has been very open about her pregnancy issues in the past.
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Kardashian has also hinted that her fourth child might be the couple's last baby.
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