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7. Kylie Jenner

Who: Kylie Jenner
What: Reality TV star turned entrepreneur
Why she's an 'It' girl: The youngest member of the Kardashian-Jenner clan has learned a thing or two about being an 'It' girl from her sisters. With nearly 65 million Instagram followers - that's 5 million more than her supermodel sister - Kylie is one of the top 10 most followed celebrities on the site. In 2015, she launched Kylie Cosmetics and a best-selling app that reached number 1 in the iTunes app store.