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LONDON, UNITED KINGDOM - MARCH 28: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge attends the Portrait Gala 2017 at the National Portrait Gallery on March 28, 2017 in London, England. (Photo by Max Mumby/Indigo/Getty Images)

LONDON, UNITED KINGDOM - MARCH 28: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge attends the Portrait Gala 2017 at the National Portrait Gallery on March 28, 2017 in London, England. (Photo by Max Mumby/Indigo/Getty Images)
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Getty Images Entertainment Max Mumby/Indigo

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LONDON, ENGLAND - MARCH 28: Catherine, Duchess of Cambridge attends the 2017 Portrait Gala at the National Portrait Gallery on March 28, 2017 in London, Britain. (Photo by Neil Hall - WPA Pool/Getty Images)

LONDON, ENGLAND - MARCH 28: Catherine, Duchess of Cambridge attends the 2017 Portrait Gala at the National Portrait Gallery on March 28, 2017 in London, Britain. (Photo by Neil Hall - WPA Pool/Getty Images)
Getty Images

Getty Images Entertainment WPA Pool