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Kate chose a chic dove grey coat by the British fashion house, teaming it with a slightly darker coloured hat by Jane Taylor.
The Duchess waved to the waiting crowds and she and Prince William made their way to St Andrew's Cathedral in the Sydney sun.
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Following the 10:30am service, the Duke and Duchess signs the First Fleet Bible, a historical King James Bible that first brought over to Australia on the First Fleet in 1788.
William and Kate joined a long line of British royals who have added their name to the Bible, including the Queen, Prince Philip, Prince Charles and Princess Diana.
