SLAVE LAKE, AB - JULY 6: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge visit a part of town devastated by a fire in May 2011, on July 7, 2011 in Slave Lake, Alberta. The newly married Royal Couple are on the seventh day of their first joint overseas tour. The 12 day visit to North America is taking in some of the more remote areas of the country such as Prince Edward Island, Yellowknife and Calgary. The Royal couple started off their tour by joining millions of Canadians in taking part in Canada Day celebrations which mark Canada's 144th Birthday.  (Photo by Mark Large-Pool/Getty Images)
SLAVE LAKE, AB - JULY 6:  Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge inspect a fire-damaged car in a part of town devastated by a fire in May 2011, on July 7, 2011 in Slave Lake, Alberta. The newly married Royal Couple are on the seventh day of their first joint overseas tour. The 12 day visit to North America is taking in some of the more remote areas of the country such as Prince Edward Island, Yellowknife and Calgary. The Royal couple started off their tour by joining millions of Canadians in taking part in Canada Day celebrations which mark Canada's 144th Birthday.  (Photo by Mark Large - Pool/Getty Images)
SLAVE LAKE, AB - JULY 6:  Prince William, Duke of Cambridge inspects a fire-damaged car in a part of town devastated by a fire in May 2011, on July 7, 2011 in Slave Lake, Alberta. The newly married Royal Couple are on the seventh day of their first joint overseas tour. The 12 day visit to North America is taking in some of the more remote areas of the country such as Prince Edward Island, Yellowknife and Calgary. The Royal couple started off their tour by joining millions of Canadians in taking part in Canada Day celebrations which mark Canada's 144th Birthday.  (Photo by Mark Large - Pool/Getty Images)
SLAVE LAKE, AB - JULY 6:  (NO UK SALES FOR 28 DAYS)  Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge visit a part of town devastated by a fire in May 2011 on July 7, 2011 in Slave Lake, Alberta.  (Photo by Samir Hussein/WireImage)
YELLOWKNIFE, NT - JULY 06:  Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge arrive before boarding a plane at Yellowknife Airport on July 6, 2011 in Yellowknife, Canada. The newly married Royal Couple are on the seventh day of their first joint overseas tour. The 12 day visit to North America is taking in some of the more remote areas of the country such as Prince Edward Island, Yellowknife and Calgary. The Royal couple started off their tour by joining millions of Canadians in taking part in Canada Day celebrations which mark Canada's 144th Birthday.  (Photo by John Stillwell-Pool/Getty Images)