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20. Charli XCX

Who: Charli XCX
What: Singer / Songwriter
Why she's an 'It' girl:  The English singer/songwriter made a name for herself in 2014 when her single "Boom Clap" from the soundtrack album of The Fault in Our Stars became a top ten single in a number of countries. Most recently Charli XCX played the voice of Willow in The Angry Birds Movie.