Katie Nicholl

On the eve of what would have been Queen Elizabeth II's centenary, Her Majesty's longtime personal assistant, advisor, and curator tells Katie Nicholl what the revered monarch was really like.

Despite tensions between the US and the UK, King Charles is said to be “looking forward to the trip,” which will take place from April 27 to April 30.

On Tuesday, the royal family observed the day with tributes, engagements, and a reception, which author Hugo Vickers described as “an appropriate way to remember the Queen.”

As the royal state visit begins in Washington, DC, on Monday, King Charles is in a unique position to “use his role as a statesman to exercise soft power,” says royals historian Ed Owens.

Under the guidance of his most trusted aides, King Charles wrote and delivered a speech that's already being called one of the most important of his reign.

When King Charles and Queen Camilla landed in the United States on Monday, they both donned matching brooches showing the British and American flags intertwined.

A source says the Princess of Wales, who hasn't traveled solo in 4 years, is "energized and excited" to return to the country where she studied while she was in college.

While the 22-year-old daughter of Prince Edward and Sophie, Duchess of Edinburgh, is not a working royal, she's one of the chief organizers of the Royal Windsor Horse Show, which begins Thursday.

Prince William, Kate Middleton, and more royals are expected to attend what a spokesman for Phillips has described as a “private ceremony.”

As rumors swirl that Prince George will follow in his father’s footsteps and enroll in Eton college, Princess Charlotte may also be starting a new school next year.