Kensington Palace

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An overview shows The White Garden, a new memorial garden which marks 20 years since the death of Britain's Princess Diana, at Kensington Palace in London, Thursday, April 13, 2017. Kensington Palace was the home of Princess Diana for 15 years and is now a residence for her two sons Prince Harry and Prince William, with his wife Kate and their two children George and Charlotte. (AP Photo/Matt Dunham)

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This image made available by Kensington Palace Saturday and taken by Kate, Duchess of Cambridge, at Amner Hall, eastern England, in mid-May 2015 shows Britain's Princess Charlotte being held by her brother, 2-year-old, Prince George. (Associated Press)

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The birth certificate of Princess Charlotte of Cambridge which was signed by her father, Prince at Kensington Palace in London Tuesday May 7, 2015, and witnessed by a Registrar from Westminster Register Office.(John Stillwell/Pool Photo via AP)

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A model wears a design created by Burberry Prorsum Womenswear during London Fashion Week Autumn/Winter 2014, at Perks Field, Kensington Palace, in Hyde Park, central London, Monday, Feb. 17, 2014. (Photo by Joel Ryan/Invision/AP)

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Model Jourdan Dunn, centre, wears a design created by Burberry Prorsum Womenswear during London Fashion Week Autumn/Winter 2014, at Perks Field, Kensington Palace, in Hyde Park, central London, Monday, Feb. 17, 2014. (Photo by Joel Ryan/Invision/AP)

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Model Cara Delevingne, centre right, wears a design created by Burberry Prorsum Womenswear during London Fashion Week Autumn/Winter 2014, at Perks Field, Kensington Palace, in Hyde Park, central London, Monday, Feb. 17, 2014. (Photo by Joel Ryan/Invision/AP)