Both future kings will pay tribute to the Queen tonight (Picture: Getty)

Prince Charles and Prince William will speak in honour of the Queen at a special concert tonight as part of the Platinum Jubilee celebrations.

The future kings will make their tributes towards the end of the open-air show, to be held in front of Buckingham Palace tonight and screened on the BBC.

Celebrity acts taking part include Diana Ross, Queen + Adam Lambert, Alicia Keys, Hans Zimmer, George Ezra, and Eurovision 2022 runner-up Sam Ryder – with a live crowd of 22,000 people and a television audience of millions.

The Queen herself is not expected to attend the Platinum Party at the Palace concert, but will confirm on the day if she will make any public appearances.

Yesterday, she said she would not be able to attend the thanksgiving service at St Paul’s Cathedral as she had experienced some discomfort on the first day of celebrations on Thursday, when she waved at crowds from the Buckingham Palace balcony and led the beacon lighting ceremony.

The Duchess of Cambridge said later the Queen had enjoyed Thursday’s celebrations but the day had been ‘very tiring’.

A crowd fills The Mall as they wait for the royal family to appear on the balcony of Buckingham Palace on Thursday (Picture: Getty)

The keen horse-racing fan will also not attend today’s Epsom Derby Day, but watch it on TV from Windsor.

Jubilee celebrations at the course will still go ahead as planned, with the Princess Royal expected to represent her mother.

The track intends to honour the monarch with 40 jockeys who have ridden for her (she owns and breeds race horses) donning the royal silks to form a guard of honour, while a number of her former racehorses will parade.

Today is also the first birthday of Harry and Meghan’s daughter Lilibet, who travelled with the Sussexes and older brother Archie for her first visit to the UK.

She and Archie have not yet been seen publicly during the visit, although their parents were spotted watching the Trooping the Colour ceremony on Thursday, and attended the St Paul’s service.

The Party at the Palace will be set on three stages in front of the Queen’s London residence.

Soul legend Diana Ross will close the two-and-a-half hour show with her first UK live performance in 15 years.

Star including Sir David Attenborough, Emma Raducanu, David Beckham and Stephen Fry will also feature, as well as a specially recorded performance from Sir Elton John.

The evening will highlight global themes that have emerged or evolved during the the Queen’s reign including British and Commonwealth contributions in the fields of fashion, sport, the environment and pop music.

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Queen Elizabeth II’s Platinum Jubilee 2022