Prince William, Kate and Prince George in New Zealand

Catherine, the Duchess of Cambridge, tries to hit a ball using a cricket bat as she and her husband, Britain's Prince William, attend a promotional event for the upcoming Cricket World Cup in Christchurch, New Zealand, April 14, 2014.

The Prince and his wife Kate are undertaking a 19-day official visit to New Zealand and Australia with their son George.

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Britain's Prince William reacts as he tries to hit a ball using a cricket bat as he and his wife Catherine, the Duchess of Cambridge, attend a promotional event for the upcoming Cricket World Cup in Christchurch, April 14, 2014.

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Catherine, Duchess of Cambridge, stands with young rugby players as she and her husband, Britain's Prince William, watch a young players' rugby tournament held at Forsyth Barr Stadium in Dunedin, New Zealand, April 13, 2014.

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Catherine, Duchess of Cambridge, and her husband, Britain's Prince William, wear buoyancy vests before taking a jet-boat ride on the Shotover River in Queenstown, New Zealand, April 13, 2014.

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Catherine, Duchess of Cambridge meets members of the public in Latimer Square Gardens on April 14, 2014 in Christchurch, New Zealand.

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Britain's Prince William (L) and his wife Catherine, Duchess of Cambridge, take a look around after the ceremony to open the new visitors center, in the Christchurch botanical gardens, April 14, 2014.

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Britain's Prince William (L) laughs as his wife, Catherine (C), the Duchess of Cambridge, stands next to a Sopwith Pup vintage plane he is sitting in at the Omaka Aviation Heritage Center near Blenheim, New Zealand, April 10, 2014.

Britain's Prince William and his wife Kate are undertaking a 19-day official visit to New Zealand and Australia with their son George.

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Britain's Prince William and his wife Catherine, Duchess of Cambridge, bow their heads during a ceremony at the war memorial in Seymour Square in the town of Blenheim, April 10, 2014.

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Britain's Prince William and his wife Catherine, Duchess of Cambridge, walk together as they prepare to lay a wreath at the war memorial in Seymour Square in the town of Blenheim, April 10, 2014.

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Britain's Prince William (R) reacts as he meets members of the crowd after laying a wreath with his wife, Catherine, Duchess of Cambridge, at the war memorial in Seymour Square in the town of Blenheim, April 10, 2014.

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Britain's Catherine, the Duchess of Cambridge, looks at a vintage plane at the Omaka Aviation Heritage Center near Blenheim, April 10, 2014.

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Britain's Prince William (R) meets children in the crowd after laying a wreath with his wife Catherine, the Duchess of Cambridge, at the war memorial in Seymour Square in the town of Blenheim, April 10, 2014.

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Britain's Catherine (L), the Duchess of Cambridge, is photographed by New Zealand film director Peter Jackson (R) as she stands next to a Sopwith Pup vintage plane at the Omaka Aviation Heritage Center near Blenheim, April 10, 2014.

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Britain's Prince William (R) looks with his wife Catherine, the Duchess of Cambridge, at a flying hat that was a gift for their son Prince George at the Omaka Aviation Heritage Center near Blenheim, April 10, 2014.

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Catherine, the Duchess of Cambridge, reacts as she greets a baby after laying a wreath with her husband, Britain's Prince William, at the war memorial in Seymour Square in the town of Blenheim, April 10, 2014.

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Kate, Duchess of Cambridge, holds her son, Prince George, during a Plunket nurse and parents' group event at Government House in Wellington, New Zealand, April 9, 2014. Plunket is a national not-for-profit organization that provides care for children and families in New Zealand.

Prince William and his wife, Kate, are undertaking a 19-day official visit to New Zealand and Australia with their son, Prince George.

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Kate, Duchess of Cambridge, holds her son, Prince George, as she talks to other parents at a Plunket play group event at Government House in Wellington, New Zealand, April 9, 2014.

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Prince George, right, son of Britain's Prince William and his wife, Kate, Duchess of Cambridge, plays with a toy during a Plunket nurse and parents group event at the Government House in Wellington, New Zealand, April 9, 2014.

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Prince George, right, son of Britain's Prince William and his wife, Kate, Duchess of Cambridge, looks at other babies during a Plunket nurse and parents group event at the Government House in Wellington, New Zealand, April 9, 2014.

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Kate, Duchess of Cambridge, holds her son, Prince George, during a Plunket nurse and parents' group event at Government House in Wellington, New Zealand, April 9, 2014.

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Kate, Duchess of Cambridge, reacts as she plays with her son, Prince George, during a Plunket nurse and parents group event at the Government House in Wellington, New Zealand, April 9, 2014.

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Catherine, the Duchess of Cambridge, holds her son Prince George after disembarking their plane with her husband Britain's Prince William in Wellington, April 7, 2014.

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Britain's Prince William and Kate, Duchess of Cambridge, with Prince George, arrive for their visit to New Zealand at the International Airport, in Wellington, New Zealand, on April 7, 2014. The Duke and Duchess of Cambridge are on a three-week tour of Australia and New Zealand, the first official trip overseas with their son, Prince George of Cambridge.

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Prince William and Kate, Duchess of Cambridge, with Prince George, arrive for their visit to New Zealand at the International Airport, in Wellington, New Zealand, on April 7, 2014.

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Kate, Duchess of Cambridge, holding Prince George of Cambridge, arrives at Wellington Military Terminal on an RNZAF 757 from Sydney on April 7, 2014, in Wellington, New Zealand.

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Prince William and Kate, Duchess of Cambridge, with Prince George, arrive for their visit to New Zealand at the International Airport, in Wellington, New Zealand, on April 7, 2014.

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Prince William and Kate, Duchess of Cambridge, with Prince George, arrive for their visit to New Zealand at the International Airport, in Wellington, New Zealand, on April 7, 2014.

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Prince William and Kate, Duchess of Cambridge, with Prince George, arrive for their visit to New Zealand at the International Airport, in Wellington, New Zealand, on April 7, 2014.

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Prince William and Kate, Duchess of Cambridge, with Prince George, arrive for their visit to New Zealand at the International Airport, in Wellington, New Zealand, on April 7, 2014.

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Kate, Duchess of Cambridge, Prince William, Duke of Cambridge, and Prince George of Cambridge arrive at Wellington Military Terminal on an RNZAF 757 from Sydney on April 7, 2014, in Wellington, New Zealand.

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Prince William and Kate, Duchess of Cambridge, with Prince George, arrive for their visit to New Zealand at the International Airport, in Wellington, New Zealand, on April 7, 2014.

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Prince William, Duke of Cambridge, Kate, Duchess of Cambridge, and Prince George of Cambridge arrive at Wellington Airport on April 7, 2014, in Wellington, New Zealand.

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Prince William and Kate, Duchess of Cambridge, with Prince George, arrive for their visit to New Zealand at the International Airport, in Wellington, New Zealand, on April 7, 2014.

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Prince William and Kate, Duchess of Cambridge, with Prince George, arrive for their visit to New Zealand at the International Airport, in Wellington, New Zealand, on April 7, 2014.

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Kate, Duchess of Cambridge, holds Prince George while arriving for their visit to New Zealand at the International Airport, in Wellington, New Zealand, April 7, 2014.

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New Zealand's Prime Minister John Key watches as Prince William and Kate, Duchess of Cambridge, with Prince George, arrive for their visit to New Zealand at the International Airport, in Wellington, New Zealand on April 7, 2014.

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Kate, Duchess of Cambridge, holds Prince George as they arrive with Prince William at Wellington Military Terminal on an RNZAF 757 from Sydney on April 7, 2014, in Wellington, New Zealand.

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Prince William and Kate, Duchess of Cambridge, with Prince George, arrive for their visit to New Zealand at the International Airport, in Wellington, New Zealand, on April 7, 2014.

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Prince William, Duke of Cambridge, speaks to Prime Minister John Key as he arrives with Kate, Duchess of Cambridge, and Prince George at Wellington Airport on April 7, 2014, in Wellington, New Zealand.

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Britain's Prince William, left, and his wife, Kate, Duchess of Cambridge, meet the Governor-General of New Zealand Lt. Gen. Jerry Mateparae, right, with his wife, Janine, second right, during a welcoming ceremony at Government House in Wellington, New Zealand, on April 7, 2014.

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Kate, Duchess of Cambridge, receives a "hongi" (a traditional Maori greeting) from a Maori elder during a welcoming at Government House in Wellington, New Zealand, on April 7, 2014.

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Britain's Prince William, left, receives a "hongi" (a traditional Maori greeting) from a Maori elder during a welcoming at Government House in Wellington, New Zealand, on April 7, 2014.

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Prince William and his wife, Kate, Duchess of Cambridge, meet a Maori performance group during a welcoming ceremony at Government House in Wellington, New Zealand, on April 7, 2014.

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Prince William and his wife, Kate, Duchess of Cambridge, are talked through the presentation by Maori elders during a welcoming ceremony at Government House in Wellington, New Zealand, on April 7, 2014.

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Prince William and his wife, Kate, Duchess of Cambridge, meet local schoolchildren during a welcoming ceremony at Government House in Wellington, New Zealand, on April 7, 2014.