OTTAWA, ON - JULY 02: (NO UK SALES FOR 28 DAYS) Catherine, Duchess of Cambridge attends a tree planting ceremony at Rideau Hall on day 3 of the Royal Couple's North American Tour on July 2, 2011 in Ottawa, Canada. (Photo by Samir Hussein/WireImage)
OTTAWA, ON - JULY 02: (NO UK SALES FOR 28 DAYS) Catherine, Duchess of Cambridge attends a tree planting ceremony at Rideau Hall on day 3 of the Royal Couple's North American Tour on July 2, 2011 in Ottawa, Canada. (Photo by Samir Hussein/WireImage)