Photo taken on Sept. 7, 2015 shows the Picture Gallery of the Buckingham Palace in London, capital of Britain. The Buckingham Palace has served as the official London residence of Britain's sovereigns since 1837 and today is the administrative headquarters of the Monarch. (Xinhua/Han Yan)

Photo taken on Sept. 7, 2015 shows the Blue Drawing Room of the Buckingham Palace in London, capital of Britain. The Buckingham Palace has served as the official London residence of Britain's sovereigns since 1837 and today is the administrative headquarters of the Monarch. (Xinhua/Han Yan)

Photo taken on Sept. 7, 2015 shows a staff member cleaning a billboard at the Buckingham Palace in London, capital of Britain. The Buckingham Palace has served as the official London residence of Britain's sovereigns since 1837 and today is the administrative headquarters of the Monarch. (Xinhua/Han Yan)

Photo taken on Sept. 7, 2015 shows the piano in the White Drawing Room of the Buckingham Palace in London, capital of Britain. The Buckingham Palace has served as the official London residence of Britain's sovereigns since 1837 and today is the administrative headquarters of the Monarch. (Xinhua/Han Yan)

Photo taken on Sept. 7, 2015 shows the ballroom set for a state banquet at the Buckingham Palace in London, capital of Britain. The Buckingham Palace has served as the official London residence of Britain's sovereigns since 1837 and today is the administrative headquarters of the Monarch. (Xinhua/Han Yan)

Photo taken on Sept. 7, 2015 shows dresses worn by Britain's Queen Elizabeh II on display at the Buckingham Palace in London, capital of Britain. The Buckingham Palace has served as the official London residence of Britain's sovereigns since 1837 and today is the administrative headquarters of the Monarch. (Xinhua/Han Yan)

Photo taken on Sept. 7, 2015 shows the Australian State Coach used in the State Visit procession at the Buckingham Palace in London, capital of Britain. The Buckingham Palace has served as the official London residence of Britain's sovereigns since 1837 and today is the administrative headquarters of the Monarch. (Xinhua/Han Yan)

Photo taken on Sept. 7, 2015 shows the White Drawing Room of the Buckingham Palace in London, capital of Britain. The Buckingham Palace has served as the official London residence of Britain's sovereigns since 1837 and today is the administrative headquarters of the Monarch. (Xinhua/Han Yan)