The couple was welcomed to Parliament Hill on Canada Day by the country's Prime Minister, Stephen Harper.
Prince William and his wife arrived in style in an open-top carriage, waving at well-wishers - much like they did as they left Westminster Abbey in London after their wedding ceremony in April (11).
The couple is on its first official overseas tour.
Marking Canada’s 144th birthday, the prince spoke of his family ties to Canada - in French and English - and he told reporters his wife had learned about Canada from her late grandfather, who had trained in Alberta as a pilot during World War Two.
He added that his grandmother The Queen had "asked me to convey her warmest good wishes to the people of Canada, and her happy and abiding memories of being on Parliament Hill with the Duke of Edinburgh one year ago.”
Catherine, the Duchess of Cambridge thrilled locals by wearing a maple leaf brooch - on loan from The Queen - on her cream Reiss dress for the proceedings. The maple leaf is Canada's national emblem.