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12. Selena Gomez

Who: Selena Gomez
What: Actress + recording artist
Why she's an 'It' girl: The Disney star turned serious recording artist released her second studio album Revival in 2015, which debuted at number 1 on the Billboard 200, followed by a worldwide Revival Tour in 2016. According to Billboard, she has sold over 6.7 million albums and 22 million singles worldwide. Aside from being super talented, Selena is the poster-child for philanthropic service. In 2009, she became the youngest UNICEF ambassador ever (at 17 years old) and has since been named spokesperson for several UNICEF campaigns and the ambassador of DoSomething.org.