Royals British Royal Family Prince William Steps Out Hours After Kate Middleton's Mother's Day Photo Apology The Prince of Wales joined Queen Camilla and other members of the family at the annual Commonwealth Day service By Simon Perry Simon Perry Simon Perry is a writer and correspondent at PEOPLE. He has more than 25 years’ experience at PEOPLE covering the royals, human interest and celebrity. People Editorial Guidelines Published on March 11, 2024 11:23AM EDT Queen Camilla and Prince William attend the Commonwealth Day service on March 11, 2024. Photo: HENRY NICHOLLS/POOL/AFP via Getty Prince William is making his first appearance since his wife Kate Middleton apologized for the controversy over the editing of an official family photo. The Prince of Wales, 41, joined Queen Camilla and other members of the royal family at Westminster Abbey for the Commonwealth Day service on Monday. The service began with the congregation singing "God Save the King," then Queen Camilla and Prince William leading the royals in the procession side-by-side. Although she's usually a regular at the event, Princess Kate wasn't expected to attend the Commonwealth Day service amid her surgery recovery. She is not expected back at her royal duties until after Easter. However, the Princess of Wales, 42, was pictured on Monday riding in a car with her husband heading to a "private appointment." Prince William attends Commonwealth Day service on March 11, 2024. HENRY NICHOLLS/POOL/AFP via Getty Prince William's outing came about four hours after Princess Kate issued a statement on social media apologizing for editing a picture of her and her three children, Prince George, 10, Princess Charlotte, 8, and Prince Louis, 5. The image, released on Sunday to mark Mother's Day in the U.K., was the first official photograph of the Princess of Wales since her abdominal surgery on Jan. 16. But it led to the palace facing questions after established photo agencies, including the AP and Reuters, withdrew the photo citing concerns over manipulation. On Monday morning, Princess Kate said she was sorry for "any confusion" about the picture, which was taken by Prince William at their family home in Windsor. In a statement shared on the Prince and Princess of Wales' official Instagram and X account, she wrote, "Like many amateur photographers, I do occasionally experiment with editing. I wanted to express my apologies for any confusion the family photograph we shared yesterday caused. I hope everyone celebrating had a very happy Mother's Day." She signed the note with a "C" for Catherine, indicating the personal nature of the message. Prince William attends the Commonwealth Day service on March 11, 2024. Samir Hussein/WireImage Kate Middleton's Condition Is Shrouded in 'Radio Silence,' Palace Insider Says (Exclusive) After more than a week of questions about Princess Kate's health and social media rumors following her abdominal surgery, the picture was meant to both thank people for their good wishes and calm fears about the royal's health. However, the photo sparked controversy as media outlets questioned if it had been manipulated. Prince William kept up his public duty amid the controversy as he arrived at Westminster Abbey in London on Monday afternoon. Can't get enough of PEOPLE's Royals coverage? Sign up for our free Royals newsletter to get the latest updates on Kate Middleton, Meghan Markle and more! Queen Camilla, Prince William, Prince Edward, Duchess Sophie and Princess Anne at the Commonwealth Day service on March 11, 2024. GEOFF PUGH/POOL/AFP via Getty Queen Camilla, 76, represented King Charles, 75, who couldn't attend the annual service due to his ongoing cancer treatment, while other members of the royal family, including Prince Edward, who celebrated his 60th birthday over the weekend, and his wife, Sophie, the Duchess of Edinburgh, were also in attendance. Other royals in attendance included Princess Anne, the Duke and Duchess of Gloucesterand the Duke of Kent. This marked a rare appearance at the Commonwealth Day service for Queen Elizabeth's cousins, according to Gert's Royals. While the Duchess of Gloucester has attended the event once before, this year was the Duke of Gloucester and the Duke of Kent's first time at the staple on the royal calendar. Royal Family in Turmoil as Demands Mount for More Transparency: 'There Is Too Much Uncertainty' (Exclusive) Geri Halliwell-Horner attends Commonwealth Day service on March 11, 2024. Samir Hussein/WireImage Spice Girl Geri Halliwell-Horner was among the 2,000 people who gathered at Westminster Abbey for the Commonwealth Day service. In a video message played for the service, King Charles thanked people for their support. "I have been most deeply touched by your wonderfully kind and thoughtful good wishes for my health and, in return, can only continue to serve you, to the best of my ability, throughout the Commonwealth," King Charles said. The service celebrated the global network of 56 countries with the 2024 theme “One Resilient Common Future: Transforming our Commonwealth." In his address, King Charles made the link with his own lifetime, as he is as old as the institution. "It warms my heart to reflect on the way the Commonwealth has been a constant throughout my own life — a precious source of strength, inspiration and pride," he said. Urging people to “work together to understand each other’s perspectives, including the inequalities and injustices which still resonate to this day,” he added that “our diversity is our greatest strength.” As they left the Commonwealth Day service, Queen Camilla accepted flowers from a local schoolgirl, who dipped into a curtsy for the royal. Prince William also greeted the children outside with a handshake and chatted with the choir members. Queen Camilla at the Commonwealth Day service on March 11, 2024. Chris Jackson/Getty