The Queen attends the Commonwealth Day observance

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STORY: Britain's Queen Elizabeth led a royal delegation in observance of Commonwealth Day in London's Westminster Abbey on Monday, featuring performances by musicians including Canadian Rufus Wainwright.

Wearing a pink dress and matching pink hat, the Queen was accompanied by Prince Philip, Prince Charles and his wife Camilla, the Duchess of Cornwall, and Sophie, the Countess of Wessex.

Formed of 54 sovereign states, the Commonwealth is an intergovernmental organization consisting mostly of states that were part of the British Empire. The queen is still head of state for some of them, including Canada, Australia and New Zealand.

Canadian singer Rufus Wainwright was one of the first performers, playing the piano and singing a soulful rendition of Leonard Cohen's "Hallelujah."