Kate Middleton and Princess Charlotte, left, Pippa Middleton, centre, Prince William and Prince Harry, right
Actress Meghan Markle attends the Mercedes-Benz Star Lounge during Mercedes-Benz Fashion Week Fall 2014 at Lincoln Center on February 8, 2014 in New York City. (Photo by Mike Coppola/Getty Images for Mercedes-Benz)
Federer celebrating with the championship trophy inside the locker room. Photo: Getty Images
Prince George, left, and Princess Charlotte, right
Britain's Prince William (R) Kate Duchess of Cambridge and Prince Harry leave after a service of thanksgiving for Queen Elizabeth's 90th birthday at St Paul's Cathedral
(L-R) Camilla, Duchess of Cornwall, Prince Charles of Wales, Catherine, Duchess of Cambridge, Princess Charlotte of Cambridge, Prince George Of Cambridge and Prince William, Duke of Cambridge watch a fly past during the Trooping the Colour, this year marking the Queen's 90th birthday at The Mall on June 11, 2016 in London, England. The ceremony is Queen Elizabeth II's annual birthday parade and dates back to the time of Charles II in the 17th Century when the Colours of a regiment were used as a rallying point in battle. (Photo by Ben A. Pruchnie/Getty Images)
May 2015: Photo released by the Duke and Duchess of Cambridge of Prince George and Princess Charlotte. The photograph was taken by the Duchess in mid-May at Anmer Hall in Norfolk.
Pippa Middleton, sister of the Duchess of Cambridge goes for a run outside her London home a day after she announced her engagement to financier James Matthews. Picture: Philip Toscano/PA Wire
Carole Middleton steps out in Orla Kiely as she arrives at The Lindo Wing after visiting her daughter Kate.
When socialite Pippa Middleton weds hedge fund manager James Matthews on May 20, it's set to be the biggest wedding of the year. Here's everything we know about what to expect.
Prince George and Princess Charlotte will have starring roles.
Prince George, left, and Princess Charlotte, right
Kensington Palace have confirmed three-year-old Prince George and Princess Charlotte, who will be two then, will be a page boy and bridesmaid. Just think of the pictures. Pippa's cousin, 14-year-old Tallulah (whose father Gary is often considered the Middleton family black sheep) will also be in the bridal party.
Kate Middleton, Prince William and Prince Harry will all be in attendance but Kate's role is still unclear.
Britain's Prince William (R) Kate Duchess of Cambridge and Prince Harry leave after a service of thanksgiving for Queen Elizabeth's 90th birthday at St Paul's Cathedral
Britain's Prince William (R) Kate Duchess of Cambridge and Prince Harry leave after a service of thanksgiving for Queen Elizabeth's 90th birthday at St Paul's Cathedral
It's still unclear whether or not Kate will reciprocate the maid of honour duties her younger sister performed at her 2011 nuptials as she's reportedly planning on taking on a lesser role so as not to distract from the bride. She is a future queen after all.
Her husband Prince William will be joining in the festivities and was pictured leaving Pippa and James' €18m Chelsea mansion last week as the families get to know each other before the big day.
Pippa Middleton and James Matthews attend church on Christmas Day on December 25, 2016 in Bucklebury, Berkshire. (Photo by Samir Hussein/Samir Hussein/WireImage)
Pippa Middleton and James Matthews attend church on Christmas Day on December 25, 2016 in Bucklebury, Berkshire. (Photo by Samir Hussein/Samir Hussein/WireImage)
Video of the Day
Pippa and James will exchange vows at St Mark's Church in Englefield, Berkshire before partying at the Middleton family home in Bucklebury. The decision to host the reception at the family home provides them with unrivalled privacy, but given they own 18 acres of land, it won't exactly be a cosy affair.
Vogue Williams & Spencer Matthews leaving RTE studios together where Vogue was a guest on Brendan O'Connor's Cutting Edge
You might be asking yourself, "Why would Vogue Williams be there?" but the Irish tv presenter has been dating reality tv star Spencer Matthews, the groom's younger brother and expected Best Man, for the last two months.
A spokesperson for the former Fade Street star said she had a "prior engagement" and would not be attending one of the most talked about weddings of the decade.
Actress Meghan Markle attends the Mercedes-Benz Star Lounge during Mercedes-Benz Fashion Week Fall 2014 at Lincoln Center on February 8, 2014 in New York City. (Photo by Mike Coppola/Getty Images for Mercedes-Benz)
Actress Meghan Markle attends the Mercedes-Benz Star Lounge during Mercedes-Benz Fashion Week Fall 2014 at Lincoln Center on February 8, 2014 in New York City. (Photo by Mike Coppola/Getty Images for Mercedes-Benz)
Prince Harry might be a confirmed guest, but his girlfriend of one year - and if rumours are to be believed, a future princess, won't be in attendance in light of Pippa's 'no ring, no bring' rule. Only wives and fiancées were added to the guestlist.
The bride and groom will be jetting to James' parents plush hotel in St Barts - Eden Rock before the big day.
The Duke and Duchess of Cambridge with their children, Prince George, and Princess Charlotte, who was christened at Sandringham on Sunday Photo: Mario Testino / Art Partner
The Duke and Duchess of Cambridge with their children, Prince George, and Princess Charlotte, who was christened at Sandringham on Sunday Photo: Mario Testino / Art Partner
The Middletons made their fortune with their Party Pieces company and Carole is said to be thrilled being more hands-on with Pippa's wedding in comparison to Kate's - which was largely organised by the palace as it was a royal occasion.