Norway's Princess Martha Louise (L) and her husband Ari Benn arrive at Copenhagen Cathedral for the wedding ceremony of Denmark's Crown Prince Federik to Australian Mary Donaldson May 14, 2004. Crown Prince Frederik and Mary Donaldson are set to exchange marriage vows in the Copenhagen Cathedral in front of 800 people including heads of state, European and Asian royals, dignitaries and friends amid tight security. REUTERS/Yves Herman