09:34AM, Friday 18 May 2012
The Duke and Duchess of Cambridge and other royals are also expected to join the Queen for the sumptious occasion.
Those expected are the King of Bahrain, the Emperor of Japan, the King of Tonga, and President Khalifa bin Zayed of the UAE.
Also set to celebrate Her Majesty's 60 years are the Sultan of Brunei, Sheikh Ahmad Hmoud Al-Sabah of Kuwait and the Emir of Qatar.
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