Prince William arrives at close friend Duke of Westminster's society wedding

Prince William has arrived at the society wedding of his close friend the Duke of Westminster, who had until now been dubbed "Britain's most eligible bachelor".

The heir to the throne is acting as an usher at the ceremony at Chester Cathedral, which will see billionaire aristocrat Hugh Grosvenor, 33, and Olivia Henson, 31, tie the knot.

The Prince of Wales arrived at the cathedral at about 10.30am, leaving a Mercedes and entering through a side entrance unseen by many of the people in the crowds gathered on the street outside.

It is expected the wedding will be attended by some 400 guests.

The occasion has been billed as one of the most prestigious social events of the year.

Read more on Duke of Westminster:
Who is the royal dubbed Britain's most eligible bachelor marrying?

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William's brother the Duke of Sussex is not expected to attend by mutual agreement, amid a long-running rift between the princes.

Other notable absences include the Princess of Wales, who has been out of the public eye as she undergoes treatment for cancer, and the King, the groom's godfather, who had been at D-Day commemorations in France on Thursday.

The Duke of Westminster is godfather to William's son, Prince George, and also, reportedly, to Harry's son Prince Archie.

Ten-year-old George is not expected to attend due to it being a school day.

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