As the Queen's 90th birthday celebrations come to a close, the British royals stepped out for one final fete on Sunday (June 12). The Duke and Duchess of Cambridge and Prince Harry were among the well-heeled senior royals who greeted fans on The Mall at the Patron's Lunch.

They left the palace by car and travelled to the top of the Mall before getting out to greet the crowds, shaking hands and chatting to delighted guests who had braved the rain especially for the occasion.

TAP TO SEE FULL GALLERYKate wowed in a blue Roksanda Ilincic dress

Princes William and Harry looked dapper for the occasion in navy suits, while Kate impressed in a blue Roksanda Ilincic dress with a pink-panelled waistline.

Prince Harry chatted to fans who had lined The Mall

Joining the royal party were Prince Andrew and his daughters Princesses Beatrice and Eugenie, who left Buckingham Palace on foot and walked along the Mall, spending almost half an hour mingling with guests.

The British royals were met by rapturous applause

Meanwhile, Prince Edward and Sophie Wessex's daughter Lady Louise Windsor appeared poised as she participated in her first royal walkabout at the age of just 12, talking to guests as she walked along on her own.

Prince Andrew and Princesses Beatrice and Eugenie left Buckingham Palace on foot

The Queen and Duke of Edinburgh arrived in their open topped state review vehicle, and waved to the delighted crowds as they slowly travelled along the Mall before joining the Prince William, Kate and Prince Harry on the Admiralty Arch Stage for official thanks and speeches.

The Queen and Prince Philip travelled in their open topped car

Her Majesty was resplendent in a Karl Ludwig couture coat in deep cerise with a floral silk dress and matching hat by Angela Kelly, one of her favourite designers. The Queen appeared amused to spot her daughter Princess Anne still talking to people in the crowd, saying to her: "Oh, you're still here!"

"Of course!" her daughter replied.

Zara Phillips and Mike Tindall were also in attendance

Following the speeches, the Queen and Prince Philip led the parade down the Mall and took their seats in the royal box to watch the procession reach its impressive finale.

The event has been organized by the Queen's grandson, Peter Phillips, in recognition of Her Majesty's patronage of more than 600 organisations in the UK and around the Commonwealth. Some 10,000 guests attended the festivities, many of whom were dressed in patriotic ensembles and waved Union Jack flags.