SYDNEY, AUSTRALIA - OCTOBER 26: Prince Frederik of Denmark and Princess Mary of Denmark greet Kai (L), Siobhan Pereira (2nd L), Lillian (C) and Charlotte Harding (2nd R) as the royal couple arrive for a visit to the Australian Twin Registry (ATR) at the Sydney Children's Hospital on October 26, 2013 in Sydney, Australia. Prince Frederik and Princess Mary will visit Sydney for five days and will attend events to celebrate the 40th anniversary of the Sydney Opera House and the Danish architect who designed the landmark, Jorn Utzen. (Photo by William West-Pool/Getty Images)
