Formerly of East Malling, Mr Pelly is thought to have asked the princes to be ushers at his wedding to Holiday Inn heiress Lizzy Wilson in 2014.
As with her previous two children, Kate chose an all cream ensemble by Alexander McQueen, with a Jane Taylor fascinator, and beamed as she carried her youngest to the venue, while William held hands with George and Charlotte.
The Duchess of Cambridge looked stunning at Prince Louis' christening on Monday, and since the Queen and Prince Philip did not attend the special day, it is thought that Kate paid tribute to her son's great grandmother by wearing a pair of earrings much like the Queen's. George, who turns five next week, looked handsome in a white short-sleeved shirt with blue buttons, which appears to be the "Daniel" shirt by Amaia, which he also wore for Trooping the Colour this year.
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The 11-week-old will be baptised by the Archbishop of Canterbury, the Most Reverend Justin Welby, in the palace's Chapel Royal.
This was the first time the Duke and Duchess of Cambridge stepped out with all three children. Like his siblings Prince George and Princess Charlotte before him, Louis will be dressed up in an article of clothing that carries the weight of history.
Louis wore a handmade replica of the Royal Christening Robe, made by Angela Kelly, who is a dressmaker to the Queen. Prince William was by Kate's side, supportive as ever.
Following the church service, the guests were invited to a private tea at Clarence House, residence of Prince Charles and his wife Camilla.
Prince Louis was born on April 23 and is fifth in line to the British throne.