Kate Middleton serves as unofficial bridesmaid at Pippa Middleton's wedding -- see her return the favor!

Six years after Pippa Middleton became the most famous bridesmaid in the world in her all-white gown at her sister, Kate Middleton's wedding to Prince William at Westminster Abbey, the royal returned the favor and was by Pippa's side at her big day on Saturday.

Kate was spotted outside the church with Pippa as she prepped marry James Matthews at St. Mark's Church in Englefield, England.

Rumors initially swirled about whether Kate, 35, would serve as a bridesmaid at Pippa's wedding given her royal stature and celebrity status. But, Pippa, who looked absolutely stunning in a lace Giles Deacon gown, with a long train and flowing veil, eschewed traditions and chatter and had Kate beside her as she prepped to walk down the aisle.

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See Kate and Pippa Middleton together at Pippa's wedding
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See Kate and Pippa Middleton together at Pippa's wedding
ENGLEFIELD GREEN, ENGLAND - MAY 20: Pippa Middleton and Catherine, Duchess 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 UK Press Pool/UK Press via Getty Images)
ENGLEFIELD, ENGLAND - MAY 20: Catherine, Duchess of Cambridge, right, arranges the train of her sister of her sister Pippa Middleton as she arrives with her father Michael Middleton for her wedding to James Matthews at St Mark's Churchon May 20, 2017 in Englefield, England. Middleton, the sister of Catherine, Duchess of Cambridge is to marry hedge fund manager James Matthews in a ceremony Saturday where her niece and nephew Prince George and Princess Charlotte are in the wedding party, along with sister Kate and princes Harry and William. (Photo by Kirsty Wigglesworth - Pool/Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Pippa Middleton and James Matthews smile as they are joined by Catherine, Duchess of Cambridge, right, after their wedding at St Mark's Church onMay 20, 2017 in Englefield, England(Photo by Arthur Edwards - WPA Pool/Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Catherine, Duchess 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 UK Press Pool/UK Press via Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Catherine, Duchess 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 UK Press Pool/UK Press via Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Catherine, Duchess 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 UK Press Pool/UK Press via Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Catherine, Duchess of Cambridge attends the wedding of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by UK Press Pool/UK Press via Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Catherine, Duchess of Cambridge attends the wedding of Pippa Middleton and James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by UK Press Pool/UK Press via Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Michael Middleton, Pippa Middleton and Catherine, Duchess 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 UK Press Pool/UK Press via Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Princess Charlotte of Cambridge, bridesmaid and Catherine, Duchess 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 Samir Hussein/Samir Hussein/WireImage)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Pippa Middleton, James Matthews and Catherine, Duchess of Cambridge leave after getting married at 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, ENGLAND - MAY 20: Pippa Middleton and James Matthews smile after their wedding at St Mark's Church on May 20, 2017 in in Englefield, England. Middleton, the sister of Catherine, Duchess of Cambridge married hedge fund manager James Matthews in a ceremony Saturday where her niece and nephew Prince George and Princess Charlotte was in the wedding party, along with sister Kate and princes Harry and William. (Photo by Kirsty Wigglesworth - Pool/Getty Images)
ENGLEFIELD, ENGLAND - MAY 20: Catherine, Duchess of Cambridge, right, walks with the flower boys and girls, including Prince George, second right, and Princess Charlotte after the wedding of Pippa Middleton and James Matthews at St Mark's Church ion May 20, 2017 in in Englefield, England. Middleton, the sister of Catherine, Duchess of Cambridge married hedge fund manager James Matthews in a ceremony Saturday where her niece and nephew Prince George and Princess Charlotte was in the wedding party, along with sister Kate and princes Harry and William. (Photo by Kirsty Wigglesworth - Pool/Getty Images)
ENGLEFIELD, ENGLAND - MAY 20: Pippa Middleton and James Matthews smile after their wedding at St Mark's Church on May 20, 2017 in in Englefield, England. Middleton, the sister of Catherine, Duchess of Cambridge married hedge fund manager James Matthews in a ceremony Saturday where her niece and nephew Prince George and Princess Charlotte was in the wedding party, along with sister Kate and princes Harry and William. (AP Photo/Kirsty Wigglesworth, Pool)
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)
Pippa Middleton (L) and her new husband James Matthews leave St Mark's Church in Englefield, west of London, on May 20, 2017 following their wedding ceremony. 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 / Justin TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)
Pippa Middleton (R) kisses her new husband James Matthews, following their wedding ceremony 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 / Justin TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Catherine, Duchess of Cambridge stands with her daughter Princess Charlotte of Cambridge, a bridesmaid, following the wedding of her sister Pippa Middleton to James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by Justin Tallis - WPA Pool)
Pippa Middleton and her new husband James Matthews leave St Mark's Church in Englefield, west of London, on May 20, 2017 following their wedding ceremony. 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 AND AFP PHOTO / Justin TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Princess Charlotte of Cambridge, bridesmaid and Catherine, Duchess 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 Samir Hussein/Samir Hussein/WireImage)
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Basically, while Kate was not an "official" bridesmaid, she was the only attendant to Pippa, and was seen adjusting her train to ensure the 32-year-old bride looked absolutely perfect. Kate was also spotted keeping all the page boys and flower girls in line and keeping them quiet before the ceremony.

After the bride and groom said "I do" in the church, Kate, who was clad in a silk, blush pink dress and a matching hat, was also spotted helping Pippa as she exited the church. The traditional photo with her sister by her side looked extremely similar to Kate's own post-ceremony shots.

PHOTOS: All the details from Pippa Middleton's big day

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Pippa Middleton's wedding day
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Pippa Middleton's wedding day
ENGLEFIELD GREEN, ENGLAND - MAY 20: Pippa Middleton arrives for her wedding to James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by Justin Tallis - WPA Pool)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Bride Pippa Middleton and her new husband James Matthews seen leaving St Mark's Church after their Wedding Ceremony on May 20, 2017 in Englefield, England. (Photo by Neil Mockford/GC Images)
Britain's Catherine, Duchess of Cambridge, (back row R) watches as her sister Pippa Middleton (C) walks with her new husband James Matthews (L), following their wedding 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 / Justin TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Catherine, Duchess of Cambridge and Princess Charlotte of Cambridge, bridesmaid leave 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, ENGLAND - MAY 20: Catherine, Duchess of Cambridge, right, walks with the flower boys and girls after the wedding of Pippa Middleton and James Matthews at St Mark's Churchon May 20, 2017 in in Englefield, England. Middleton, the sister of Catherine, Duchess of Cambridge married hedge fund manager James Matthews in a ceremony Saturday where her niece and nephew Prince George and Princess Charlotte was in the wedding party, along with sister Kate and princes Harry and William. (AP Photo/Kirsty Wigglesworth, Pool)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Pippa Middleton (R) is escorted by her father Michael Middleton as she arrives for her wedding to James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by Justin Tallis - WPA Pool)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Pippa Middleton (R) is escorted by her father Michael Middleton as she arrives for her wedding to James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by Justin Tallis - WPA Pool)
Pippa Middleton (centre R) kisses her new husband James Matthews, following their wedding ceremony at St Mark's Church in Englefield, west of London, on May 20, 2017, as the bridesmaids, including Britain's princess Charlotte (L) and pageboys, including Britain's prince George (2R), walk ahead. 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 / Justin TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Pippa Middleton (R) is escorted by her father Michael Middleton as she arrives for her wedding to James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by Justin Tallis - WPA Pool)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Pippa Middleton (R) is escorted by her father Michael Middleton as she arrives for her wedding to James Matthews at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by Justin Tallis - WPA Pool)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Pippa Matthews and James Matthews exit the church after their wedding ceremony at St Mark's Church on May 20, 2017 in Englefield Green, England. (Photo by Samir Hussein/Samir Hussein/WireImage)
ENGLEFIELD, ENGLAND - MAY 20: Pippa Middleton arrives for her wedding to James Matthews at St Mark's Church on May 20, 2017 in Englefield, England. Middleton, the sister of Catherine, Duchess of Cambridge is to marry hedge fund manager James Matthews in a ceremony Saturday where her niece and nephew Prince George and Princess Charlotte are in the wedding party, along with sister Kate and princes Harry and William. (Photo by Kirsty Wigglesworth - Pool/Getty Images)
ENGLEFIELD, ENGLAND - MAY 20: Donna Air, left, arrives at St Mark's Church ahead of the wedding of Pippa Middleton and James Matthews on May 20, 2017 in Englefield, England. Middleton, the sister of Catherine, Duchess of Cambridge is to marry hedge fund manager James Matthews in a ceremony Saturday where her niece and nephew Prince George and Princess Charlotte are in the wedding party, along with sister Kate and princes Harry and William. (Photo by Kirsty Wigglesworth - Pool/Getty Images)
Spencer Matthews, center, stands at the entrance of St Mark's Church in for the wedding of Pippa Middleton and his brother James Matthews on May 20, 2017 in Englefield, England. Middleton, the sister of Catherine, Duchess of Cambridge is to marry hedge fund manager James Matthews in a ceremony Saturday where her niece and nephew Prince George and Princess Charlotte are in the wedding party, along with sister Kate and princes Harry and William. (Photo by Kirsty Wigglesworth - 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)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Prince George of Cambridge leaves 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)
Pippa Middleton (R) poses for a photograph with her new husband James Matthews, following their wedding ceremony 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)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Swiss tennis player Roger Federer (L) and his wife Mirka 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)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Gary Goldsmith (L), uncle of the bride attends 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)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Swiss tennis player Roger Federer (L) and his wife Mirka 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)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Donna Air (L) attends 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)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Guests seen arriving at St Mark's Church for the Wedding of Pippa Middleton and James Matthews on May 20, 2017 in Englefield, England. (Photo by Neil P. Mockford/GC Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Guests seen arriving at St Mark's Church for the Wedding of Pippa Middleton and James Matthews on May 20, 2017 in Englefield, England. (Photo by Neil P. Mockford/GC Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Catherine, Duchess of Cambridge and Princess Charlotte of Cambridge, bridesmaid leave 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: Bride Pippa Middleton and her father Michael Middleton seen arriving at St Mark's Church for her Wedding to James Matthews on May 20, 2017 in Englefield, England. (Photo by Neil P. Mockford/GC Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Pippa Middleton and Michael Middleton seen arriving at St Mark's Church for the Wedding of Pippa Middleton and James Matthews on May 20, 2017 in Englefield, England. (Photo by Neil P. Mockford/GC Images)
Britain's Prince George waves as he leaves in a car after attending the wedding of his aunt, 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 / Justin TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Bride Pippa Middleton and her father Michael Middleton seen arriving at St Mark's Church for her Wedding to James Matthews on May 20, 2017 in Englefield, England. (Photo by Neil P. Mockford/GC Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Catherine, Duchess of Cambridge arrives with her children Prince George of Cambridge, Pageboy and Princess Charlotte of Cambridge, bridesmaid, along with other Pageboys Casimir Tatos, Edward Sebire, William Ward and other bridesmaids Countess Philippa Hoyos, Lily French and Avia Horner at 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: Pippa Middleton and her father Michael Middleton arrive at 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: Pippa Middleton and her father Michael Middleton arrive at 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 waits for the bride with her children Prince George of Cambridge, page boy and Princess Charlotte of Cambridge, bridesmaid at 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: Princess Charlotte of Cambridge, bridesmaid and Catherine, Duchess of Cambridge arrive for 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)
Michael Middleton (L), walks with his daughter Pippa Middleton, as they arrive for her wedding to 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)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Catherine, Duchess of Cambridge leads the page boys and flower girls as they arrive for 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)
Britain's Catherine, Duchess of Cambridge (L) stands with her daughter Britain's princess Charlotte, and the other bridesmaids and pageboys, as they await Pippa Middleton to arrive for her wedding to 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 AND AFP PHOTO / Justin TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: Princess Charlotte of Cambridge, bridesmaid attends 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)
Nanny to Prince George and Princess Charlotte of Cambridge, Maria Borrallo, walks to the church ahead of 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 George (L), a pageboy, Britain's princess Charlotte, a bridesmaid, stand with their nanny Maria Borrallo, as they attend the wedding of their aunt Pippa Middleton to 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 AND AFP PHOTO / Justin TALLIS (Photo credit should read JUSTIN TALLIS/AFP/Getty Images)
ENGLEFIELD GREEN, ENGLAND - MAY 20: James Middleton greets Donna Air as she attends 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: Spencer Matthews (C) brother of James Matthews attends 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: Spencer Matthews brother of James Matthews, greets Donna Air as she attends 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: Spencer Matthews brother of James Matthews (L) as Donna Air is welcomed to 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: Princess Beatrice (L) attends 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)
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)
Pippa Middleton, (R) arrives with her father Michael Middleton, in a 1951 Jaguar Mk V car, for her wedding to 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)
Gary Goldsmith and daughter Tallulah arrive ahead of the wedding of Pippa Middleton to her millionaire groom James Matthews, dubbed the society wedding of the year at, St Mark's church in Englefield, Berkshire.
Pippa Middleton and James Matthews wave as they drive a Jaguar E-Type after their wedding, dubbed the society wedding of the year, at St Mark's church in Englefield, Berkshire.
Pippa Middleton and James Matthews wave as they drive a Jaguar E-Type after their wedding, dubbed the society wedding of the year, at St Mark's church in Englefield, Berkshire.
Pippa Middleton and her husband James Matthews leave St Mark's church in Englefield, Berkshire, following their wedding.
Pippa Middleton and her husband James Matthews leave St Mark's church in Englefield, Berkshire, following their wedding.
Prince George and Princess Charlotte at the wedding of the Duchess of Cambridge's sister Pippa Middleton to her millionaire groom James Matthews, dubbed the society wedding of the year at, St Mark's church in Englefield, Berkshire.
Guests arrive ahead of the wedding of the Duchess of Cambridge's sister Pippa Middleton to her millionaire groom James Matthews, dubbed the society wedding of the year at, St Mark's church in Englefield, Berkshire.
Guests arrive ahead of the wedding of the Duchess of Cambridge's sister Pippa Middleton to her millionaire groom James Matthews, dubbed the society wedding of the year at, St Mark's church in Englefield, Berkshire.
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Like the stunning family affair that even the royal wedding was, it looked like Pippa did the same and really leaned on her big sister throughout the day.

And what a glamorous and gorgeous day it was!

PHOTOS: Take a look back at Pippa at Kate's wedding

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Pippa's 'show-stopping' royal wedding moment
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Pippa's 'show-stopping' royal wedding moment
LONDON - APRIL 29: Catherine, Duchess of Cambridge and her father Michael Middleton arrive with Pippa Middleton (R) for her wedding with Prince William, Duke of Cambridge at Westminster Abbey on April 29, 2011 in London, England. (Photo by Samir Hussein/WireImage)
LONDON, ENGLAND - APRIL 29: Catherine Middleton (R) arrives to her Royal Wedding to Prince William with her father Michael Middleton (C) and sister/maid of honour Pippa Middleton (L) at Westminster Abbey on April 29, 2011 in London, England. The marriage of the second in line to the British throne is to be led by the Archbishop of Canterbury and will be attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by Ian Gavan/GP/Getty Images)
LONDON, ENGLAND - APRIL 29: Sister of the bride and Maid of Honour Pippa Middleton arrives to attend the Royal Wedding of Prince William to Catherine Middleton at Westminster Abbey on April 29, 2011 in London, England. The marriage of the second in line to the British throne is to be led by the Archbishop of Canterbury and will be attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by Pascal Le Segretain/Getty Images)
Catherine Middleton And Pippa Middleton Arrive At Westminster Abbey. (Photo by Antony Jones/Julian Parker/Mark Cuthbert/UK Press via Getty Images)
LONDON, ENGLAND - APRIL 29: Maid of Honour Pippa Middleton and the page boys and bridesmaids arrive for the Royal Wedding of Prince William to Catherine Middleton on April 29, 2011 in London, England. The marriage of the second in line to the British throne was led by the Archbishop of Canterbury and was attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by Georges De Keerle/GP/Getty Images)
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