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George sits on Prince Charles' knee as family photo released for 70th birthday

Prince Charles has posed for an official portrait to mark his 70th Birthday in the gardens of Clarence House.

The photo, posted to Twitter by Clarence House on Tuesday, shows the Prince of Wales in the gardens of Clarence House with Camilla, Duchess of Cornwall; Prince William; Kate, Duchess of Cambridge; Prince George; Princess Charlotte; Prince Louis; Prince Harry; and Meghan, Duchess of Sussex, in London, England.

Britain's Prince Charles poses for an official portrait to mark his 70th Birthday in the gardens of Clarence House, with Camilla, Duchess of Cornwall, Prince William, Kate, Duchess of Cambridge, Prince George, Princess Charlotte, Prince Louis, Prince Harry and Meghan, Duchess of Sussex, in London, England. Source: Associated Press

Meanwhile, stars of stage and screen celebrated the British royal's birthday with a gala theatre performance in London.

The eldest son of the Duke and Duchess of Cambridge can be seen grinning from ear to ear in the garden at Clarence House. Source: Breakfast

Accompanied by his wife Camilla, the heir to the British throne was guest of honour at a show called We Are Most Amused and Amazed at the London Palladium.

There was sustained applause as the audience gave the prince three birthday cheers.

Afterwards he met an array of stars including Kylie Minogue, Rowan Atkinson, Cheryl, Dynamo, Alexander Armstrong and Ben Miller.

The UK royal was a guest of honour at a show called We Are Most Amused and Amazed at the London Palladium. Source: Associated Press

The prince's eye was caught by two glove puppets, Sooty and Sweep, who have been a children's favourite in Britain for half a century or more.

The theatre performance took place on 23 October but the footage was held back until Tuesday evening, when the show was screened by British broadcaster ITV.

Charles turns 70 on Wednesday.

Prince Charles poses for an official portrait to mark his 70th Birthday in the gardens of Clarence House. Source: Associated Press