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The British monarch, who turns 88 on Monday, looked radiant in a sky blue coat and matching hat and she and her husband the Duke of Edinburgh attended St George's chapel.
Prince Eugenie, the Queen's granddaughter, made the trip back to the UK from New York although was unaccompanied by her sister Princess Beatrice.
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Eugenie, 24, is currently working in the Big Apple, having secured a job at auction house Paddle8, while her elder sister Beatrice, 25, is on holiday in the luxury island of St Barts with her boyfriend Dave Clark.
The Countess of Wessex sported a chic beige mac as she arrived at the church with her daughter Lady Louise Windsor who was dressed in a navy coat, white tights and silver shoes.
Princess Anne sported a vibrant green coat for the occassion although she wasn't joined by her daughter Zara Tindall, who was busy at the Hambledon Horse Trials in Oxford with her baby daughter Mia.
Notably absent from proceedings were Prince Charles, the Duchess of Cornwall and Prince Harry as well as Prince William and Duchess Kate, who are on tour with Prince George in Australia.