But the day also included a ceremonial arrival to the White House, where they were greeted by Trump and Melania on the South Lawn, where four chairs were set up for them.
One clip doing the rounds on social media shows the two ladies, both wearing all white, sitting down and whispering to each other ahead of the president’s address.
However, it seems that the British weather followed the royals to America, as it was lightly spitting with rain in the capital.
According to lip reader Nicola Hickling, who spoke to the Daily Mail, Melania was left confused by a particular two-word phrase used by the Queen.
The expert, who analysed the clip, believes that the Queen remarked: “Oh, it’s rather wet,” to which Melania laughed: “It certainly is.”
Camilla reportedly responded with: “We shall have soggy bottoms,” which Melania apparently seemed to question what she’d said, enquiring: “Soggy bottom.”