King Charles delights well-wishers on The Mall
People camped out on The Mall were rewarded when the King made an impromptu visit, just 24 hours before the Coronation.
William and Kate joined the King for the surprise walkabout meeting royalists who have staked their spot on the famous London thoroughfare.
The Princess of Wales described the King's coronation as a "great moment for celebration" as the Prince praised The Mall's "party atmosphere".
With Prince George set to play a starring role in the coronation and Princess Charlotte and Prince Louis expected to attend the historic event, the princess revealed her children were "a bit nervous" and "excited" and could not wait for the day.
The King shook dozens of outstretched hands and laughed when one man asked if he was "nervous for tomorrow", while another royal fan said: "Love you, I'm from Italy," and a third told the King, "Good luck for tomorrow".
With wet weather forecast for tomorrow His Majesty described rain as a 'blessing' as he shook the hand of our Senior Reporter.
The walkabout last for around 20 minutes with many hands being shaken and selfies being taken.
Preparations for the Coronation are nearing completion with The Mall decorated with huge union flags and others from the Commonwealth and crash barriers and other crowd control measures in place.
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