“George, Charlotte, Louis and I are so proud of you. Happy Birthday, Catherine. We love you.”
The statement varied greatly from those usually posted by members of the Royal Family online as it showed the prince and his emotional side, something that really came to light more than ever last year during Kate’s cancer battle.
Speaking on behalf of JeffBet, body language expert Darren Stanton said the statement also showed that William is not afraid to show his love for Kate.
He said: “For someone to make such an overt display of public affection, whether it’s physical or a statement on social media, it usually means they are confident to speak this openly behind closed doors.
“This is not the behaviour we’ve typically seen from older royals but it shows we’re in a new era. William clearly loves his wife, is forging his own path as the future King and isn’t afraid to show his emotions.”
He continued: “William’s tribute to Kate demonstrates the love and connection they already share and no doubt proves they’ve become more open and honest about their feelings after enduring such a challenge last year.”
It is believed Princess Kate would have spent her birthday at their home Adelaide Cottage in Windsor with her nearest and dearest family members.
After finishing her chemotherapy in September, the Princess of Wales has been recovering at home as she continues a gradual return to work, which is set to continue this year.
