Kylie Jenner -- I"m On Baby Duty! (Hurry Back, Blac Chyna) (VIDEO)

Rest easy, Blac Chyna … Kylie Jenner’s watching your firstborn, and we’ll say this for her babysitting skills — at least every single moment is captured on video. Kylie was hanging with 4-year-old King Cairo — Chyna’s son with Tyga — while BC…

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