MILAN, ITALY - MAY 09: BILLY (Bill Kaulitz) at the photo art exhibition and book launch of BILLY at 10 Corso Como on May 9, 2016 in Milan, Italy. (Photo by Pietro D'Aprano/Getty Images for BILLY)

MILAN, ITALY - MAY 09:  BILLY (Bill Kaulitz) at the photo art exhibition and book launch of BILLY at 10 Corso Como on May 9, 2016 in Milan, Italy.  (Photo by Pietro D'Aprano/Getty Images for BILLY)