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ENGLEFIELD GREEN, UNITED KINGDOM - MAY 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince William, Duke of Cambridge and Prince Harry attend the wedding of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by Max Mumby/Indigo/Getty Images)

ENGLEFIELD GREEN, UNITED KINGDOM - MAY 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince William, Duke of Cambridge and Prince Harry attend the wedding of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by Max Mumby/Indigo/Getty Images)

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ENGLEFIELD GREEN, ENGLAND - MAY 20: Britain's Prince Harry (R) and Britain's Prince William, Duke of Cambridge attend the wedding of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by Justin Tallis - WPA Pool/Getty Images)

ENGLEFIELD GREEN, ENGLAND - MAY 20:  Britain's Prince Harry (R) and Britain's Prince William, Duke of Cambridge attend the wedding of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England.  (Photo by Justin Tallis - WPA Pool/Getty Images)

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ENGLEFIELD GREEN, ENGLAND - MAY 20: Prince William, Duke of Cambridge and Prince Harry (R) attend the wedding of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by Samir Hussein/Samir Hussein/WireImage)

ENGLEFIELD GREEN, ENGLAND - MAY 20: Prince William, Duke of Cambridge and Prince Harry (R) attend the wedding of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England.  (Photo by Samir Hussein/Samir Hussein/WireImage)

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Britain's Prince Harry (R) and Britain's Prince William, Duke of Cambridge arrive at the church for the wedding of Pippa Middleton and James Matthews at St Mark's Church in Englefield, west of London, on May 20, 2017. Pippa Middleton hit the headlines with a figure-hugging outfit at her sister Kate's wedding to Prince William but now the world-famous bridesmaid is becoming a bride herself. Once again, all eyes will be on her dress as the 33-year-old marries financier James Matthews on Saturday at a lavish society wedding where William and Kate's children will play starring roles. / AFP PHOTO / POOL / Justin TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)

Britain's Prince Harry (R) and Britain's Prince William, Duke of Cambridge arrive at the church for the wedding of Pippa Middleton and James Matthews at St Mark's Church in Englefield, west of London, on May 20, 2017.
Pippa Middleton hit the headlines with a figure-hugging outfit at her sister Kate's wedding to Prince William but now the world-famous bridesmaid is becoming a bride herself. Once again, all eyes will be on her dress as the 33-year-old marries financier James Matthews on Saturday at a lavish society wedding where William and Kate's children will play starring roles. / AFP PHOTO / POOL / Justin TALLIS        (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)

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ENGLEFIELD GREEN, ENGLAND - MAY 20: Spencer Matthews (C), brother of the groom, greets Britain's Prince William, Duke of Cambridge, and Britain's Prince Harry (L) as they attend the wedding of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by Justin Tallis - WPA Pool/Getty Images)

ENGLEFIELD GREEN, ENGLAND - MAY 20: Spencer Matthews (C), brother of the groom, greets Britain's Prince William, Duke of Cambridge, and Britain's Prince Harry (L) as they attend the wedding of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England.  (Photo by Justin Tallis - WPA Pool/Getty Images)