US singer Katy Perry performs at the Ziggo Dome in Amsterdam, on March 09, 2015 as part of her Prismatic World Tour. AFP PHOTO/ANP/FERDY DAMMAN - netherlands out - (Photo credit should read Ferdy Damman/AFP/Getty Images)
US singer Katy Perry performs at the Ziggo Dome in Amsterdam, on March 09, 2015 as part of her Prismatic World Tour. AFP PHOTO/ANP/FERDY DAMMAN - netherlands out - (Photo credit should read Ferdy Damman/AFP/Getty Images)