Express.co.uk's body language expert Judi James recently assessed Edward and Sophie's long standing romance to figure out the key to its longevity.
Ms James claimed Sophie is the "ideal partner" for the Prince, integrating into the royal fold with ease in an "unfussy way".
"[The Countess] was a perfect complement for her husband's trait of apparently taking himself a little too seriously," she said.
Ms James also noted the irony that of all the Queen's children, Prince Edward was the one least expected to form a strong, stable marriage - he is now tenth in line to the throne.
Despite her relatively normal childhood in Oxford, Sophie is herself descended from King Henry IV of England which may have helped her assimilation into the House of Windsor.
She is also said to be a favourite of the Queen from the first time they met.