The bride-to-be and Kensington Palace confirmed on Monday that Prince George will serve as a page boy while Princess Charlotte will appear as a bridesmaid on May 20 when Middleton marries her financier beau James Matthews.
The couple will say their "I dos" at St. Mark's Church in Englefield, which is just seven miles from the Middleton family home in Bucklebury.
3-year-old George will be pageboy and Charlotte (who will turn 2 on May 20) will be a bridesmaid at Pippa's wedding to 41-year-old hedge fund manager James Matthews.
Kensington Palace has avoided commenting on other details of the nuptials because Pippa Middleton is not a royal, the report said. He and Pippa bonded at Will and Kate's royal wedding.
Pippa and James became engaged in July previous year, when James got down on one knee in Britain's breath-taking Lake District and presented her with a diamond ring worth somewhere in the region of $300,000.
First, " the Duke and Duchess of Cambridge as well as Prince Harry " will be part of the game.
At the Royal wedding in 2011, Miss Middleton was maid of honour when she stole the spotlight from her sister with her figure-hugging striking white Alexander McQueen dress.
Kate is expected to do a reading at the ceremony, while the groom's brother Spencer Matthews is likely to be best man. Several outlets are reporting no - though she did attend the wedding of Harry's close friend Tom "Skippy" Inskip in Jamaica in March. In March, Kate attended her sister's bachelorette weekend in the French Alps, where the party skied the slopes of Meribel.
There are speculations that Pippa doesn't want anyone to outshine her on her big day, and this is why she imposed the policy. "Until things are confirmed it's just rumors".