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ENGLEFIELD GREEN, UNITED KINGDOM - MAY 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge, Prince George of Cambridge and Princess Charlotte 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 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) Catherine, Duchess of Cambridge, Prince George of Cambridge and Princess Charlotte 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 Max Mumby/Indigo/Getty Images)

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Britain's Catherine, Duchess of Cambridge (R) stands with her children Britain's prince George (L) and Britain's princess Charlotte (2R), following the wedding of her sister Pippa Middleton to James Matthews at St Mark's Church in Englefield, west of London, on May 20, 2017. After turning heads at her sister Kate's wedding to Prince William, Pippa Middleton graduated from bridesmaid to bride on Saturday at a star-studded wedding in an English country church. Middleton married financier James Matthews, 41, at a ceremony attended by the royal couple and tennis star Roger Federer, as she wore a couture dress by British designer Giles Deacon. / AFP PHOTO / POOL / Justin TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)

Britain's Catherine, Duchess of Cambridge (R) stands with her children Britain's prince George (L) and Britain's princess Charlotte (2R), following the wedding of her sister Pippa Middleton to James Matthews at St Mark's Church in Englefield, west of London, on May 20, 2017.
After turning heads at her sister Kate's wedding to Prince William, Pippa Middleton graduated from bridesmaid to bride on Saturday at a star-studded wedding in an English country church. Middleton married financier James Matthews, 41, at a ceremony attended by the royal couple and tennis star Roger Federer, as she wore a couture dress by British designer Giles Deacon.
 / AFP PHOTO / POOL / Justin TALLIS        (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)

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ENGLEFIELD GREEN, ENGLAND - MAY 20: Catherine, Duchess of Cambridge, with Prince George of Cambridge (R), page boy and Princess Charlotte of Cambridge (R), bridesmaid, after 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:  Catherine, Duchess of Cambridge, with  Prince George of Cambridge (R), page boy and Princess Charlotte of Cambridge (R), bridesmaid, after 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 Catherine, Duchess of Cambridge (R) stands with her daughter Britain's princess Charlotte, a bridesmaid, following the wedding of her sister Pippa Middleton to James Matthews at St Mark's Church in Englefield, west of London, on May 20, 2017. After turning heads at her sister Kate's wedding to Prince William, Pippa Middleton graduated from bridesmaid to bride on Saturday at a star-studded wedding in an English country church. The 33-year-old married financier James Matthews, 41, at a ceremony attended by the royal couple and tennis star Roger Federer, wearing a couture dress by British designer Giles Deacon. / AFP PHOTO / POOL AND AFP PHOTO / Justin TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)

Britain's Catherine, Duchess of Cambridge (R) stands with her daughter Britain's princess Charlotte, a bridesmaid, following the wedding of her sister Pippa Middleton to James Matthews at St Mark's Church in Englefield, west of London, on May 20, 2017.
After turning heads at her sister Kate's wedding to Prince William, Pippa Middleton graduated from bridesmaid to bride on Saturday at a star-studded wedding in an English country church. The 33-year-old married financier James Matthews, 41, at a ceremony attended by the royal couple and tennis star Roger Federer, wearing a couture dress by British designer Giles Deacon.
 / AFP PHOTO / POOL AND AFP PHOTO / Justin TALLIS        (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)

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TOPSHOT - Britain's Catherine, Duchess of Cambridge (L) speaks to her daughter Britain's princess Charlotte, a bridesmaid, following the wedding of her sister Pippa Middleton to James Matthews at St Mark's Church in Englefield, west of London, on May 20, 2017. After turning heads at her sister Kate's wedding to Prince William, Pippa Middleton graduated from bridesmaid to bride on Saturday at a star-studded wedding in an English country church. The 33-year-old married financier James Matthews, 41, at a ceremony attended by the royal couple and tennis star Roger Federer, wearing a couture dress by British designer Giles Deacon. / AFP PHOTO / POOL / KIRSTY WIGGLESWORTH (Photo credit should read KIRSTY WIGGLESWORTH/AFP/Getty Images)

TOPSHOT - Britain's Catherine, Duchess of Cambridge (L) speaks to her daughter Britain's princess Charlotte, a bridesmaid, following the wedding of her sister Pippa Middleton to James Matthews at St Mark's Church in Englefield, west of London, on May 20, 2017.
After turning heads at her sister Kate's wedding to Prince William, Pippa Middleton graduated from bridesmaid to bride on Saturday at a star-studded wedding in an English country church. The 33-year-old married financier James Matthews, 41, at a ceremony attended by the royal couple and tennis star Roger Federer, wearing a couture dress by British designer Giles Deacon.
 / AFP PHOTO / POOL / KIRSTY WIGGLESWORTH        (Photo credit should read KIRSTY WIGGLESWORTH/AFP/Getty Images)