Britain's Catherine, Duchess of Cambridge waves as she arrives on a visit to Blessed Sacrament School in Islington, London July 1, 2014. REUTERS/Stuart C. Wilson/Pool (BRITAIN ROYALS - Tags: SOCIETY ROYALS) - RTR3WMW8
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Vojvotkinja Catherine

Britain's Catherine, Duchess of Cambridge waves as she arrives on a visit to Blessed Sacrament School in Islington, London July 1, 2014. REUTERS/Stuart C. Wilson/Pool (BRITAIN ROYALS - Tags: SOCIETY ROYALS) - RTR3WMW8
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ST MARTINS, ST MARTINS - SEPTEMBER 02: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge visit the Island of St Martin's in the Scilly Isles on September 2, 2016 in St Martins, England. The Duke and Duches's visit to the Scilly Isles was delayed this morninbg due to bad weather. (Photo by Chris Jackson - WPA Pool/Getty Images)
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THIEPVAL, FRANCE - JULY 1: Catherine, Duchess of Cambridge meets British and French school children by war graves following the wreath laying, during the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memoria on July 1, 2016 in Thiepval, France. The event is part of the Commemoration of the Centenary of the Battle of the Somme at the Commonwealth War Graves Commission Thiepval Memorial in Thiepval, France, where 70,000 British and Commonwealth soldiers with no known grave are commemorated. (Photo bt Yui Mok - Pool/Getty Images)
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LONDON, UNITED KINGDOM - JUNE 09: Catherine, Duchess of Cambridge attends SportsAid's 40th anniversary dinner on June 9, 2016 in London, England. On arrival, The Duchess will met SportsAid ambassadors and young athletes who will be competing in the Rio 2016 Olympics at a pre-dinner reception, as well as some of the charity's key supporters. (Photo by Eddie Mulholland - WPA Pool/Getty Images)
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LONDON, ENGLAND - MAY 16: The Duke and Duchess of Cambridge attend the launch of Heads Together Campaign at Olympic Park on May 16, 2016 in London, England. (Photo by Stuart C. Wilson/Getty Images)
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AGRA, INDIA - APRIL 16: Catherine, Duchess of Cambridge walks in front of the Taj Mahal on April 16, 2016 in Agra, India. This is the last engagement of the Royal couple after a week long visit to India and Bhutan that has taken them in cities such as Mumbai, Delhi, Kaziranga, Bhutan and Agra. (Photo by Chris Jackson/Getty Images)
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THIMPHU, BHUTAN - APRIL 15: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge trek up to Tiger's Nest during a visit to Bhutan on the 15th April 2016 in Thimphu, Bhutan. The Royal couple are visiting Bhutan as part of a week long visit to India and Bhutan that has taken in cities such as Mumbai, Delhi, Kaziranga, Bhutan and Agra. (Photo by Mark Large - Pool/Getty Images)
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KAZIRANGA, ASSAM - APRIL 13: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge prepare to leave on a safari in Kaziranga National Park on day 4 of the royal visit to India and Bhutan on April 13, 2016 in Kaziranga, India. The Duke and Duchess of Cambridge are on a week-long tour of India and Bhutan taking in Mumbai, Delhi, Assam, Bhutan and Agra. (Photo by Chris Jackson/Getty Images)
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Britain's Prince William and Catherine (R), Duchess of Cambridge, smile during a visit to a helpline service, as part of a Heads Together campaign in London, Britain, August 25, 2016. REUTERS/Arthur Edwards/Pool - RTX2N19C
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Britain's Catherine, Duchess of Cambridge arrives for her visit to Bute Mills in Luton, Britain August 24, 2016. REUTERS/Eddie Mulholland/Pool - RTX2MVFV
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Catherine, Britain's Duchess of Cambridge, walks during a ceremony in the cemetery at the Franco-British National Memorial in Thiepval near Albert, during the commemorations to mark the 100th anniversary of the start of the Battle of the Somme, northern France, July 1, 2016. REUTERS/Francois Mori/Pool - RTX2J9XA
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Britain's Kate the Duchess of Cambridge greets guests on the Mall as they attend the Patron's Lunch, an event to mark Queen Elizabeth's 90th birthday, in London, June 12, 2016. REUTERS/Peter Nicholls TPX IMAGES OF THE DAY - RTX2FRBS
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Britain's Catherine, Duchess of Cambridge leaves an event for the Anna Freud Centre at Spencer House in London, Britain May 4, 2016. REUTERS/Kirsty Wigglesworth/Pool - RTX2CT2M
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Britain's Catherine, Duchess of Cambridge attends the 100 Women In Hedge Funds gala dinner at the Victoria and Albert Museum in London, Britain October 27, 2015. Photograph taken October 27, 2015. REUTERS/Chris Jackson/pool - RTX1TL0F
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Prince William, Duke of Cambridge (L), Catherine, Duchess of Cambridge (C) and Prince Harry (R) attend The Cinema and Television Benevolent Fund's Royal Film Performance 2015 of the new James Bond 007 film
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Britain's Catherine, Duchess of Cambridge, arrives with her daughter Princess Charlotte for her christening at the Church of St. Mary Magdalene in Sandringham, Britain July 5, 2015. REUTERS/Chris Jackson/Pool - RTX1J4FX
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Britain's Prince William and his wife Catherine, Duchess of Cambridge, arrive at a reception for young people from India and Bhutan, at Kensington Palace in London, Britain April 6, 2016. Photograph taken April 6, 2016. REUTERS/Warren Allott/pool - RTSDY63
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Britain's Catherine, Duchess of Cambridge, talks to artist John Davies about his sculpture
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Catherine, Britain's Duchess of Cambridge, tours Bletchley Park near Milton Keynes in southern England June 18, 2014. The Duchess of Cambridge was visiting the recently restored site of where British codebreakers worked during World War II to decipher encrypted messages sent by the Germans. REUTERS/Toby Melville (BRITAIN - Tags: ROYALS SOCIETY) - RTR3UFBC
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Catherine, Duchess of Cambridge, talks with an official (L) during a tour of Amsfield Winery with her husband, Britain's Prince William, in Queenstown April 13, 2014. Prince William and his wife are undertaking a 19-day official visit to New Zealand and Australia with their son, Prince George. REUTERS/Fiona Goodall/Pool (NEW ZEALAND - Tags: ROYALS) - RTR3L100
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