King Charles III

Kate Middleton attended the Trooping the Color parade Saturday in honor of King Charles III’s birthday. It was her first public appearance since her cancer diagnosis earlier this year.

Kate, the Princess of Wales, shared an emotional letter after missing the rehearsal.

Kate Middleton will miss the Trooping the Colour public rehearsal, but will she make a surprise balcony appearance?

The photograph shows King Charles III wearing his crown dressed in full royal regalia while holding Sovereign's Orb and Sovereign's Sceptre with Cross.

Top moments that stood out on social media included a red feather, a kiss, and, of course, the facial expressions of little Prince Louis.

King Charles III has been crowned at Westminster Abbey, the final mile of a seven-decade journey from heir to monarch.

In some reports, costs are projected to reach $125 million.

Most of the Commonwealth's 56 member nations are former colonies of the British Empire. In some countries, many view King Charles' coronation as an occasion to recall colonialism’s painful and bloody past.

The official coronation is set to take place on May 6 at Westminster Abbey. The service is scheduled to begin at 6 a.m. EDT, which will be 11 a.m. British Standard Time. The meteorological agency of the United Kingdom expects off-and-on showers with highs in the mid-60s.

UK Republicans argue that the monarchy is outdated and undemocratic, and that the country should be a republic with an elected head of state. The call for a republic has gained momentum in recent years.

The pomp, pageantry and symbolism of this weekend's much-anticipated occasion date back to the medieval times.

Camilla was long reviled as the other woman in Charles' marriage to Diana. After years of being torn apart by the tabloids, the 75-year-old has won over much of the British public with her down-to-earth humor and charitable work.

"The resemblance is uncanny."

"I'm just so grateful to be asked for these moments and that I have the songs to I think support them," Katy Perry said of King Charles III's coronation concert.

With his coronation less than two weeks away, King Charles III and Buckingham Palace are working swiftly to show the new king at work, including staging his first overseas state visit.

Defense Secretary Ben Wallace said it would be “a spectacular and fitting tribute" to the monarch, who is also commander-in-chief of the U.K. armed forces.

The coronation of King Charles III is expected to be a shorter, less extravagant ceremony than the three-hour service that installed Elizabeth II 70 years ago. Here are the plans.

Charles will be formally crowned on May 6 – a particularly important date for Prince Harry and Meghan as the day coincides with their son Archie's 4th birthday.