Queen Camilla is “not spending her birthday the way she’d choose”, according to a source, as the royal is set to accompany King Charles on a major outing. The State Opening of Parliament is occurring on today, which coincides with the Queen’s 77th birthday. A close friend of Camilla’s said: “It’s not the tip-top way she would choose to be spending her birthday, but you won’t ever hear a single word of complaint. “About anything, really. For someone who wasn’t born into the Royal Family, she’s got an extraordinarily strong sense of duty and the temperament to cope.” Queen Camilla has been carin…