The Princess of Wales honored her father-in-law, King Charles, in the traditional way and made a subtle homage to Queen Elizabeth during Monday’s church service.

Kate Middleton is back at the Commonwealth Day Service after missing it last year before announcing that she was undergoing treatment for cancer.

Middleton — who scaled her royal schedule back last year due to her cancer diagnosis — joined Prince William, King Charles, Queen Camilla, Princess Anne, Prince Richard, Duke of Gloucester and Birgitte, the Duchess of Gloucester, for the commemoration.

King Charles championed the royal family’s dedication to Commonwealth Day, calling for unity alongside Queen Camilla, Prince William and Kate Middleton at Westminster Abbey after he and Kate missed last year’s service due to their cancer treatments.

King Charles III and Catherine, Princess of Wales have attended the annual Commonwealth Day service, a year after both were forced to cancel because they were receiving cancer treatment. The event at Westminster Abbey on Monday celebrated the Commonwealth's "powerful influence for good in the world".

Britain's King Charles arrived for the annual Commonwealth Day service at London's Westminster Abbey on Monday (March 10) for annual celebrations for the international organization he leads. Greenland: Why is it valuable?

Catherine, Princess of Wales, joined Britain’s King Charles III and other members of the royal family in celebrating Commonwealth Day on Monday, attending an event at London’s Westminster Abbey filled with performances from countries across the association.

The King and Queen arrive alongside senior royals and VIPs at Westminster Abbey for the annual Commonwealth Day service. .

Too busy listening to the King’s playlist to tune into this year’s Commonwealth Service? Let’s get you up to speed. Commonwealth Day took place yesterday, celebrating the unity and diversity of the 56 member countries that make up the Commonwealth with a multi-faith service at Westminster Abbey.

Kate Middleton paid a subtle tribute to Princess Diana and Queen Elizabeth II with her fashion as she attended the Commonwealth Day celebrations in London March 10.