The Cambridge Kids Made the Queen and Prince Philip an Anniversary Gift

Today is Queen Elizabeth and Prince Philip's 73rd wedding anniversary, and Prince George, Princess Charlotte, and Prince Louis made them a gift.

Queen Elizabeth II and Prince Philip are celebrating 73 years of marriage today, and the royal family released a new photo of the couple yesterday to mark the occasion. In the photo, taken in Windsor Castle's Oak Room earlier this week and shared on Instagram Thursday, the Queen and Prince Philip sit on a couch together with piles of cards and letters on the table before them. They smile at a gift made by Cambridge kids Prince George, Princess Charlotte, and Prince Louis: a large anniversary card with a multicolored "73" in the center.

People noted another detail in the photo: the Queen accessorized her pale blue Stewart Parvin dress with her sapphire, diamond, and platinum Chrysanthemum Brooch. Said brooch wasn't chosen by accident, as Elizabeth was first photographed wearing it during her honeymoon with Philip at Broadlands in Hampshire, back in 1947. And she wore it again in 2007, during a photoshoot to mark the couple's 60th anniversary.

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queen elizabeth ii and the duke of edinburgh pictured 162020 in the quadrangle of windsor castle ahead of his 99th birthday on wednesday photo by steve parsonspa images via getty images

(Image credit: Steve Parsons - PA Images)