Prince George has been allowed to stay up past his bedtime for a meeting with US President Barack Obama.

The encounter took place as the president and First Lady Michelle Obama continued their visit to England.

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The Obamas, who had taken part in the Queen’s 90th birthday celebrations, were greeted at Kensington Palace by the Duke and Duchess of Cambridge.

The young prince, who turns three in July, was allowed to stay up later than usual to meet the Obamas.

Kensington Palace released photographs of the encounter to the media, showing Mr Obama crouching down to speak with the little prince.

George looked a little unsure of the new visitor, as he wore his plush dressing gown embroidered with his name, along with slippers and pyjamas.

But Prince George was all smiles as he played on a rocking horse, encouraged by his parents.

From the Kensington Palace Twitter account, the Duke and Duchess said the rocking horse was a gift from the Obamas when George was born.

The photos also showed a fluffy Portuguese water dog toy, another gift from the Obamas, that resembled Bo the White House dog.