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11. Taylor Swift

Who: Taylor Swift
What: Singer/Songwriter
Why she's an 'It' girl: Some might argue she is THE 'It' girl. In 2015, she became the youngest woman ever to be included on Forbes' '100 Most Powerful Women' list, ranked at #64. Tay and her inner circle of girlfriends have basically defined the term "squad" for this generation, preaching girl power and female empowerment.