The Duke and Duchess attended the service, which was Resurrection-themed, before signing the Fleet Bible, which has also been signed by Queen Elizabeth II, Prince Charles and Lady Diana
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Left: William looked engrossed by Dr Glenn Davies, the Anglican Archbishop of Sydney. Right: Kate's hair was pulled back in an elegant half-up style
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Kate spent some time after the service talking with the clergy, members of the choir, and young visitors
Prince George did not accompany Kate and William to the church service. But he will join them on a trip to Taronga Zoo on Sunday afternoon
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Kate and William added their signatures (top left) to the First Fleet Bible, from which the first Christian service on Australian soil was conducted in 1788. The Bible has been signed by Queen Elizabeth II, Prince Philip, Prince Charles and Diana, and the Queen Mother
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Rev Justin Moffatt, rector of St Philip's York St, the country's oldest church, presented the couple with the First Fleet Bible, to which they added their signatures
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Crowds began to form outside the cathedral early on Sunday morning. St Andrew's is located on George St, in the heart of Sydney's CBD
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The Duke and Duchess are half-way through their 10-day tour of Australia
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The Archbishop of Sydney, Glenn Davies, accompanies Kate after the Easter Sunday service at the St Andrew's Cathedral
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Royal fans gathered in Sydney's CBD hoping to catch sight of the royal couple
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Royal fans: (left) Abbie Taylor holds her Duchess of Cambridge doll as she waits for the real duchess to emerge from the church; (right) a member of the public waves a commemorative flag
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The choirboys formed a guard of honour for the royal couple as they left the church. Kate stopped to talk with several of the choirboys as she was leaving
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Outside the church, Kate greeted some children one of whom presented her with a bunch of flowers (left) and then talked to some choir boys (right)
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William and Kate greeted some young admirers outside the church after the service's conclusion
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The crowd began to gather outside the church in the early hours of the morning, as they awaited the arrival of Kate and William
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Kate carried gifts and an order of service as she exited the church. The couple will make their way to Taronga Zoo this afternoon
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Kate addresses a group of children after the Easter Sunday service at St Andrew's Cathedral
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The couple have a full schedule today. After the morning's church service, they will sign the Fleet Bible, before heading to Taronga Zoo with their son
That looks sharp! Prince William was presented with a wooden spear as he and his wife the Duchess of Cambridge arrived in Uluru in the Central Australian Desert on Tuesday
Front row: Kate and William were escorted to their seat to watch the march by veterans of World War II, 20th century conflicts such as the Korean and Vietnam Wars and the more recent wars and peacekeeping efforts
Honoured: The Anzac Day march in Canberra at the Australian War Memorial featured the honour guard and band who were applauded
Respectful: William and Kate stood for the arrival of Governor General Sir Peter Cosgrove and wife Lynne Cosgrove, who stepped from their car as the Australian national anthem was played
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Contemplative: The Duchess appeared deep in thought at the Commemorative Service at the Australian National War Memorial
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Tweed: The Palace would not release further details about Kate's outfit, as they did not want to detract from the Anzac Day service