The Cambridges are treated to a back-garden film premiere with Sir David Attenborough

With no red carpet, no flashing paparazzi bulbs and no Hollywood starlets swanning through Leicester Square in glamorous, flesh-baring gowns, it was a royal film premiere like no other.

Instead, Prince William sat on a rickety wooden chair in his back garden alongside a 94-year-old man cloaked in a tartan blanket to ward off the autumn chill.

But that man was Sir David Attenborough, who was unveiling his new documentary – and who received a reception worthy of the hottest Tinseltown star from three eager young fans, Princes George, seven, and Louis, two, and Princess Charlotte, five, after the screening.

Sir David Attenborough received a reception worthy of the hottest Tinseltown star from three eager young fans, Princes George, seven, and Louis, two, and Princess Charlotte, five, after the screening of his new documentary

Sir David Attenborough received a reception worthy of the hottest Tinseltown star from three eager young fans, Princes George, seven, and Louis, two, and Princess Charlotte, five, after the screening of his new documentary

He presented George, seven, with a tooth from an extinct giant shark, which lived 23 million years ago, which he had found on a family holiday to Malta in the late 1960s

He presented George, seven, with a tooth from an extinct giant shark, which lived 23 million years ago, which he had found on a family holiday to Malta in the late 1960s

He presented George, seven, with a tooth from an extinct giant shark, which lived 23 million years ago, which he had found on a family holiday to Malta in the late 1960s.

The three children are all interested in dinosaurs and were fascinated by the megalodon fossil and excitedly asked Sir David a number of questions.

A Palace aide said: ‘The children are massive fans of Sir David and this was the first time they had met him, although they have always wanted to. So they were absolutely delighted, and you can see from Charlotte’s reaction in the picture how excited she was.

‘They were fascinated by the shark tooth and Sir David explained how he had found it, how old it was and how it had been preserved in Malta’s soft yellow limestone.’

Kate, in a new £1,295 Gabriela Hearst denim shirt dress and £475 Rupert Sanderson pumps, smiled as Charlotte, in a £23 Zara floral Peter Pan collar dress, put her hands to her face with excitement.

George, in a £40 Trotters checked shirt and £50 Start-Rite school brogues, handled the giant tooth with evident amazement.

The joyous meeting in Kensington Palace gardens came on Thursday afternoon after William, 38, and the veteran broadcaster watched David Attenborough: A Life On Our Planet, about the naturalist’s 70-year career as a conservationist and the environmental crisis facing the planet.

Socially distanced in the open air, the Duke of Cambridge and Sir David were offered directors’ chairs with their names printed on the back – but as a joke they sat in each other’s seats. The pair then watched the 80-minute film, and Sir David gave the Prince a copy of the accompanying book.

Socially distanced in the open air, the Duke of Cambridge and Sir David were offered directors’ chairs with their names printed on the back – but as a joke they sat in each other’s seats

Socially distanced in the open air, the Duke of Cambridge and Sir David were offered directors’ chairs with their names printed on the back – but as a joke they sat in each other’s seats

The Palace aide added: ‘The Duke thought it was Sir David’s best documentary yet. It is

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