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VATICAN CITY, VATICAN - JANUARY 29: Pope Francis holds his weekly audience in St. Peter's Square on January 29, 2014 in Vatican City, Vatican. After his appearance on the cover of Rolling Stone magazine, today Pontiff was also found to be represented in a graffiti in Rome that portrays him in a superhero vest. (Photo by Franco Origlia/Getty Images)

VATICAN CITY, VATICAN - JANUARY 29:  Pope Francis holds his weekly audience in St. Peter's Square on January 29, 2014 in Vatican City, Vatican. After his appearance on the cover of Rolling Stone magazine, today Pontiff was also found to be represented in a graffiti in Rome that portrays him in a superhero vest.  (Photo by Franco Origlia/Getty Images)