STORY: Elizabeth, 96, marked seven decades on the throne in February, and nationwide events to commemorate her Platinum Jubilee, including a thanksgiving service and a music concert outside Buckingham Palace, will take place from June 2 to 5.
In parliament on Thursday, politicians delivered their tributes to the queen in a "humble address," with the debate opened by Johnson.
"No monarch by her efforts and dedication and achievement better deserves the attribute of greatness, and for me, she is already Elizabeth the Great," the prime minister said.
Elizabeth became Queen of the United Kingdom and more than a dozen other realms including Canada, Australia and New Zealand on the death of her father King George VI on Feb. 6, 1952, while she was in Kenya on an international tour.
Four days of celebrations begin next Thursday (June 1) with the traditional 'Trooping the Colour' military parade in central London, and will also include a service at London's St Paul's Cathedral on Friday (June 2), a concert outside Buckingham Palace the next day, and a pageant through the British capital on Sunday (June 4).