Princess Kate Middleton issued a 'warning' to Prince William before King Charles' coronation.

The 'warning' was about William's gown.

According to lip reader Jeremy Freeman, Kate told William to "just mind the gown".

William responded, "Don't worry I got [or caught] it".

The 'warning' occurred as they prepared to enter Westminster Abbey with Princess Charlotte and Prince Louis.

Later, the royal couple shared adorable photos and videos from the coronation.

The coronation was for King Charles III.

The royal couple expressed gratitude to everyone who made the coronation happen.

The incident added to the public's fascination with the royal family's private conversations.