President Barack Obama and his wife Michelle have been welcomed to Britain by senior royals.
The Prince of Wales and the Duchess of Cornwall met the VIP guests at Winfield House, the residence of the US Ambassador, before escorting them to Buckingham Palace.
First lady Michelle looked colourful in a blue patterned 50s style swing dress and a pink shrug.
Meanwhile, Camilla was elegant in a cream outfit by Anna Valentine with a Philip Treacy hat.
At the Palace, they were warmly greeted by the Queen and Duke of Edinburgh.
Once inside, they met the new Duke and Duchess of Cambridge, fresh from their honeymoon in the Seychelles, in the lavish 1844 room of the Palace.
The Obamas then stepped into the garden for a full ceremonial welcome, which included the playing of both the American and British National Anthem.
A 41-gun salute from the Tower of London was fired by the Honourable Artillery Company to mark the second state visit by a US President during Her Majesty's reign.