Nato leaders have arrived at Buckingham Palace this evening for a reception hosted by Queen Elizabeth II.
Donald Trump and Melania were among the first to arrive amid heavy security, as protesters took to the surrounding areas to demonstrate against the meeting.
The First Lady wore a striking yellow Valentino coat teamed with fuchsia heels, while the US President sported a dark coloured suit and royal blue tie.
Earlier today the couple met with Prince Charles and Camilla for afternoon tea at Clarence House.
The Prince of Wales and Duchess of Cornwall are also in attendance for the reception this evening, while the Duchess of Cambridge was photographed arriving by car.
The Queen was also photographed wearing a green dress, accessorised with an emerald green shawl, a pearl necklace and pearl earrings.
She could be seen smiling as she met with world leaders just days after an online hoax started in a WhatsApp group claimed she had died.
Other world leaders attending the palace this evening include German Chancellor Angela Merkel, Canadian Prime Minister Justin Trudeau and Turkish President Recep Tayyip Erdogan.
Once inside, they posed for a photo with the Queen, Prince Charles and UK Prime Minister Boris Johnson.
The meeting comes just as Labour leader Jeremy Corbyn vowed to confront President Trump after he dismissed claims he was trying to seize the NHS.
Corbyn said he will warn the president ‘public services are not for sale’.
Meanwhile hundreds of NHS workers and anti-war activists had started a protest today in the surrounding areas of the Nato visit.
Demonstrators marched from Trafalgar Square towards Buckingham Palace with placards bearing messages such as ‘No to Trump, No to War’ and ‘Trump, Hands off our NHS’.
A number of protesters expressed their fears over the impact of a future trade deal between the US and the UK on the NHS.
While others called on Nato and Turkey to stop their ‘war on Kurds’.
Police allowed protesters to make their way down The Mall as official cars carrying the world leaders arrived on the other side of the barriers.