Peter Phillips's new NHS girlfriend dons £375 dress to watch Prince William triumph at polo

The couple put on a cosy display as they walked hand-in-hand at the Out-Sourcing Inc Royal Charity Polo Cup at the Guards Polo Club at Windsor in aid of 11 different charities supported by the Prince and Princess of Wales.

Princess Anne's son, 46, who is 18th in line to the throne, has been dating Sperling for just a short period.

He split up with his partner of three years Lindsay Wallace earlier this year.

Phillips and Sperling have since spent their summer at an array of high society events, including Royal Ascot, Wimbledon and the Badminton Horse Trials.

On Friday, the couple watched Prince William, 42, show off his polo skills at the annual charity match.

NHS nurse Sperling put on an elegant display in a Beulah London V-neck floral dress as she walked hand-in-hand with the King's nephew.

The dress retails for a whopping £375.

For footwear, Sperling wore £139 pink and green espadrilles from Penelope Chilvers.

Friday was the 13th time William had played in the charity polo match.

The total sum raised after today is expected to reach an incredible £13million.

The charities concerned are all close to William and Kate's hearts and include emergency services, mental health, early years, conservation and the armed forces.

Phillips's outing came as Princess Anne returned to royal duties for the first time since suffering a concussion in a horse-related accident.

The Princess Royal was taken to Southmead Hospital in Bristol last month after she was kicked by a horse at her Gatcombe Park estate in Gloucestershire.

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The 73-year-old royal, a skilled horsewoman who competed in the 1976 Montreal Olympics, was going for a walk when the incident occurred.

Emergency services were sent to the estate and, after being given medical care at the scene, Anne was transferred to hospital for tests, treatment and observation.

On Friday, she was visiting the Riding for the Disabled Association (RDA) National Championships at Hartpury University and Hartpury College in Gloucestershire after recovering from her sudden injury.