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Camilla, 76, visited the headquarters of the eponymous firm in Norfolk - where she had also earlier stopped by a gorse sanctuary - which was started by Ms Vinader and her sister.
It's a day of celebrations at Buckingham Palace as the official Royal Family account posted a tribute to Camilla on both Instagram and Twitter as they shared smiling photos of King Charles III's wife.
Royal fans have taken to social media to send celebratory messages to the Queen, who turns 76 today.
The Queen Consort honored the late Queen Elizabeth II with a special message at the Royal Family's headquarters in London on Thursday
The Queen Consort paid tribute to the Queen, who had been a patron of the Royal Commonwealth Society since 1952.