Kate Middleton Flashes an Infectious Smile During Sunday Service With Prince William

Kate Middleton and Prince William were all smiles when they attended a church service at St. Mary Magdalene Church in King's Lynn, England, on Sunday. The royal couple was joined by Prince Harry, Prince Charles, and Queen Elizabeth II, just to name a few, and stayed true to their annual Christmas tradition of spending the holidays at Sandringham. While Will and Kate's children, Princess Charlotte and Prince George, were noticeably absent, George is reportedly set to begin nursery school at the Westacre Montessori School Nursery in Norfolk, England, in January.

Throughout the year, Will and Kate have created a long list of sweet moments together, from Prince Charlotte's exciting debut to the family's new portrait. And who could forget the time Will adorably admitted that he'd have to "ask the missus" if their kids could watch sports? Read on to see more of the royal affair, and then look back at the best pictures of the British royals from 2015.