The Duke and Duchess of Cambridge joined the Queen in Sandringham for the morning service at St. Mary Magdalene church on Sunday, but the couple were not alone. Prince William and Kate, both 37, were joined by the Duchess' parents Carole and Michael Middleton and a group of their closest friends.
WATCH: Kate's best moments as she prepares to celebrate birthday
As the Duchess is set to turn 38 on Thursday, the Cambridges hosted some of their closest companions at their country home, Anmer Hall, in Norfolk, to kick off Kate's early birthday celebrations, as they do most years.
Thomas van Straubenzee and his fiancée Lucy Lanigan-O'Keeffe
Among the guests were Thomas van Straubenzee, one of Princess Charlotte's godparents, and his fiancée Lucy Lanigan-O'Keeffe, who teaches at Thomas's Battersea – the school attended by Prince George and his sister.
Lady Laura Meade (pictured with Kate above), one of Prince Louis' godparents, attended with her husband James Meade, as well as Rose Hanbury, the Marchioness of Cholmondeley and her husband, David, the Marquess of Cholmondeley.
Rose Hanbury, wearing a brown hat, and her husband David attended
William and Kate's friends are said to have enjoyed traditional country pursuits over the weekend, before the royals returned to London to resume their duties. The couple also spent Christmas in Sandringham, where Prince George and Princess Charlotte made their public debut at the annual church service.
On Kate's birthday last year, William attended an engagement at the Royal London Hospital to mark the 30th anniversary of London's Air Ambulance Charity. The Duke was presented with a handmade card from a group of children, prompting the father-of-three to say: "Well done you for remembering, that's very impressive." He added: "I did remember this morning, so I was ok." A member of staff then asked, "Are you doing anything special today?" leaving a coy William to reply, "That would be telling!" before they all burst into laughter.
Over the festive period, Kensington Palace released a new photo of William, George, Charlotte and Louis, taken by Kate, to wish their social media followers a Happy Christmas.
Make sure you never miss a ROYAL story! Sign up to our newsletter to get all of our celebrity, royal and lifestyle news delivered directly to your inbox.