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BERLIN, GERMANY - MAY 04: Singer of the band Tokio Hotel Bill Kaulitz during the photo art exhibition and book launch of BILLY at Seven Star Gallery on May 4, 2016 in Berlin, Germany. (Photo by Franziska Krug/Getty Images)

BERLIN, GERMANY - MAY 04: Singer of the band Tokio Hotel Bill Kaulitz during the photo art exhibition and book launch of BILLY at Seven Star Gallery on May 4, 2016 in Berlin, Germany. (Photo by Franziska Krug/Getty Images)