MADRID, SPAIN - MARCH 31:  Camilla, Duchess of Cornwall and Princess Letizia of Spain  watch a display during a visit to the Guide Dogs Center at the ONCE Foundation on day two of a three day visit to Spain on March 31, 2011 in Madrid, Spain. Camilla, Duchess of Cornwall, and Prince Charles, Prince of Wales, are on a three day trip to Spain as part of a tour to Portugal, Spain and Morroco.  (Photo by Chris Jackson/Getty Images)