This Easter Sunday coincides with the Queen's 93rd birthday, and well-wishers from the general public passed on their good wishes as she made her way into the church.
The queen is marking Easter by attending a service with other senior royals at St. George's Chapel on the grounds of Windsor Castle, west of London. "Wishing you a most wonderful day!"
Harry's heavily-pregnant wife Meghan was absent, as was the Duke of Edinburgh who has retired from royal duties.
The Queen has been treated to an impromptu rendition of the song Happy Birthday, following an Easter Mattins service at St George's Chapel at Windsor Castle.
Attending Church alongside Her Majesty was The Princess Royal, Sir Tim Laurence, the Duke and Duchess of Cambridge, the Wessex Family, Duke of York, Princess Beatrice, Peter & Autumn Phillips and Zara & Mike Tindall.
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April 21 - the day the Queen was born - is the first of the monarch's two birthdays.
The Band of the Irish Guards will also perform Happy Birthday in honor of the queen on the forecourt of Buckingham Palace as part of the Changing of the Guard ceremony. She marks her official birthday in June with the Trooping the Color parade.
The Duke and Duchess haven't revealed their exact due date, but the pair are expected to welcome their first child within the coming weeks. Another fan wrote: "Would be so lovely if your baby arrived today on her birthday".
She became Britain's longest-reigning monarch, passing her great-great grandmother Queen Victoria's record, in September 2015.
The Queen will attend with members of the royal family, and now that they live so close in Windsor, they will no doubt be doing something with the monarch to mark her special day at some point.