“They have this very warm relationship,” royal expert and editor Hannah Furniss toldThe Telegraph.

Why did Princess Anne call King Charles an old bean?

“Not least of all, it solves my dress problem.”

Princess Anne and King Charles smiling at one another

On top of this, it serves as a peek into how bonded the two royal siblings really are.

“She is the person the King has known longest,” Wesley Kerr, royal commentator, toldTatler.

“She can be relied on for complete discretion and unconditional love.”

King Charles and Princess Anne standing together

Princess Anne and King Charles playing together as kids