The 18-year-old and her 20-year-old sister, Kendall Jenner, also had some fun later on showing their grandmother how to use the app.
The Kardashian-Jenner clan has always been close, but on Monday, Kylie Jenner picked a favorite. The social media-savvy star took to Instagram to wish her eldest sister, Kourtney Kardashian, a happy ...
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