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Published 17:27 15 Nov 2014 GMT
Updated 06:11 18 Dec 2014 GMT

In the below behind-the-scenes Estée Lauder video, the 19-year-old says that this is something she didn't expect to happen so quickly.
She also makes reference to the power of social media and seeing "how many people care" about what she's doing.
The video also shows Kendall as a toddler playing with her mother's make-up and it's all kinds of cute.
http://www.youtube.com/watch?v=-0wp-TLmP0AExplore more on these topics: