LONDON, ENGLAND - MARCH 28: Catherine, Duchess of Cambridge greets model Alexa Chung greets model Alexa Chung as she is escorted by National Portrait Gallery Director Nicholas Cullinan at 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)
LONDON, ENGLAND - MARCH 28: Catherine, Duchess of Cambridge attends the Portrait Gala 2017 at the National Portrait Gallery on March 28, 2017 in London, England. (Photo by Karwai Tang/WireImage)
LONDON, ENGLAND - MARCH 28: Catherine, Duchess of Cambridge stands with Chair of Trustees William Proby at 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 views work by artist Gillian Wearing at the 2017 Portrait Gala at the National Portrait Gallery on March 28, 2017 in London, Britain. (Photo by Neil Hall - WPA Pool/Getty Images)
