Kate, 44, was the picture of poise as she arrived at Gloucestershire's All Saint's Church in a pale pink dress and straw hat, alongside the Prince of Wales, 43.

The 48-year-old son of Princess Anne is set to wed Harriet, 45, on Saturday, June 6, at Gloucestershire's All Saints Church in an intimate but deeply significant affair.

Prince William and Princess Kate are expected to be among a group of major royals attending Princess Anne’s son’s nuptials tomorrow when he marries NHS nurse Harriet Sperling

Dressed in all their finery, attendees put on a vibrant show as they made their way into Gloucestershire's All Saints Church ahead of the arrival of the King's nephew.

Kate, 44, was the picture of poise as she arrived at Gloucestershire's All Saint's Church in a pale pink dress and straw hat, alongside the Prince of Wales, 43.

The Princess Royal’s son will marry NHS nurse Harriet Sperling on Saturday

It's a busy Saturday for Charles, 77, and Camilla, 78, who joined other senior royal family members at the nuptials of Princess Anne's son before heading to Epsom Downs.

Harriet Sperling arrived at the church in Gloucestershire today to marry the King's nephew Peter Phillips in an elegant white wedding dress by Emilia Wickstead with a huge…

Harriet Sperling marries Peter Phillips in a stunning royal wedding in Gloucestershire, wearing an elegant lace gown by Emilia Wickstead. | World News

At the royal wedding of Peter Phillips and Harriet Sperling, Kate Middleton impressed in a sophisticated cream outfit by Roland Mouret. | World News

Princess Kate wowed at Peter Phillips and Harriet Sperling's wedding in a Roland Mouret dress, teamed with a surprisingly affordable £28 handbag

Phillips is the late Queen Elizabeth II's eldest grandson

King Charles III and his wife Queen Camilla were among senior members of Britain's royal family who donned elegant hats, tailcoats and dresses to attend the wedding of Charles'…

The Princess Royal, 75, beamed as she arrived at All Saints Church in Kemble alongside the King and Queen and other members of the Royal family to watch her only son tie the knot.

Senior royals led the well-wishers as Princess Anne’s son married nurse Harriet Sperling at a small country church.

KEMBLE: King Charles and senior British royals gathered at a village in south-west England on Saturday to celebrate...

Queen Camilla and other senior royals joined Princess Anne's son and nurse Harriet Sperling for the ceremony in Gloucestershire