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PARIS, FRANCE - JUNE 17: US Writer John Green and model Cara Delevingne attend the Paper Towns " La Face Cachee De Margo " Photocall In Paris on June 17, 2015 in Paris, France. (Photo by Dominique Charriau/WireImage)

PARIS, FRANCE - JUNE 17:  US Writer John Green and model Cara Delevingne attend the Paper Towns " La Face Cachee De Margo " Photocall In Paris on June 17, 2015 in Paris, France.  (Photo by Dominique Charriau/WireImage)