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Amelia Thompson, 12, from Woodhouse in Sheffield, who has received an invitation to the wedding of Prince Harry and Meghan Markle at Windsor Castle next month. (Photo by Peter Byrne/PA Images via Getty Images)

Amelia Thompson, 12, from Woodhouse in Sheffield, who has received an invitation to the wedding of Prince Harry and Meghan Markle at Windsor Castle next month. (Photo by Peter Byrne/PA Images via Getty Images)

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CARDIFF, WALES - JANUARY 18: Prince Harry whispers to Meghan Markle as they watch a dance performance by Jukebox Collective in the banqueting hall during a visit to Cardiff Castle on January 18, 2018 in Cardiff, Wales. (Photo by Ben Birchall - WPA Pool / Getty Images)

CARDIFF, WALES - JANUARY 18:  Prince Harry whispers to Meghan Markle as they watch a dance performance by Jukebox Collective in the banqueting hall during a visit to Cardiff Castle on January 18, 2018 in Cardiff, Wales. (Photo by Ben Birchall - WPA Pool / Getty Images)

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LONDON, ENGLAND - JANUARY 09: Prince Harry (R) and his fiancee Meghan Markle visit Reprezent 107.3FM on January 9, 2018 in London, England. The Reprezent training programme was established in Peckham in 2008, in response to the alarming rise in knife crime, to help young people develop and socialise through radio. (Photo by Chris Jackson/Getty Images)

LONDON, ENGLAND - JANUARY 09:  Prince Harry (R) and his fiancee Meghan Markle visit Reprezent 107.3FM on January 9, 2018 in London, England. The Reprezent training programme was established in Peckham in 2008, in response to the alarming rise in knife crime, to help young people develop and socialise through radio.  (Photo by Chris Jackson/Getty Images)

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NOTTINGHAM, ENGLAND - DECEMBER 01: Prince Harry and his fiancee US actress Meghan Markle visit Nottingham Academy on December 1, 2017 in Nottingham, England. Prince Harry and Meghan Markle announced their engagement on Monday 27th November 2017 and will marry at St George's Chapel, Windsor in May 2018. (Photo by Andy Stenning - WPA Pool/Getty Images)

NOTTINGHAM, ENGLAND - DECEMBER 01:  Prince Harry and his fiancee US actress Meghan Markle visit Nottingham Academy on December 1, 2017 in Nottingham, England.  Prince Harry and Meghan Markle announced their engagement on Monday 27th November 2017 and will marry at St George's Chapel, Windsor in May 2018.  (Photo by Andy Stenning - WPA Pool/Getty Images)

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KING'S LYNN, ENGLAND - DECEMBER 25: Meghan Markle and Prince Harry attend Christmas Day Church service at Church of St Mary Magdalene on December 25, 2017 in King's Lynn, England. (Photo by Chris Jackson/Getty Images)

KING'S LYNN, ENGLAND - DECEMBER 25:  Meghan Markle and Prince Harry attend Christmas Day Church service at Church of St Mary Magdalene on December 25, 2017 in King's Lynn, England.  (Photo by Chris Jackson/Getty Images)