SYDNEY, AUSTRALIA - OCTOBER 26: Princess Mary of Denmark and Prince Frederik of Denmark pose for a photo with identical twins during 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)
