Will the Queen have a royal repeat in a historic headtopper on her birthday? Janine Henni is a Royals Staff Writer for PEOPLE Digital, covering modern monarchies and the world's most famous families.

The annual display of British military might serves as a seasonally tweaked birthday celebration for the sitting monarch.

King Charles is preparing for the annual Sovereign's Birthday Parade, also known as Trooping the Colour, even though he was ...