Britain's Princess Charlotte of Wales (L) and Britain's Prince Louis of Wales (R) attend the "Together At Christmas" Carol Service" at Westminster Abbey in London on December 8, 2023. The event will be broadcast as part of 'Royal Carols: Together At Christmas', a special programme, airing at 7:45pm on ITV1 and ITV X on Christmas Eve. (Photo by Chris Jackson / POOL / AFP) (Photo by CHRIS JACKSON/POOL/AFP via Getty Images)

Britain's Prince William, Prince of Wales (L), Britain's Prince George of Wales (2L), Britain's Catherine, Princess of Wales (R), Britain's Prince Louis of Wales (centre right) and Britain's Princess Charlotte of Wales (C) attend the "Together At Christmas" Carol Service" at Westminster Abbey in London on December 8, 2023. The event will be broadcast as part of 'Royal Carols: Together At Christmas', a special programme, airing at 7:45pm on ITV1 and ITV X on Christmas Eve. (Photo by Chris Jackson / POOL / AFP) (Photo by CHRIS JACKSON/POOL/AFP via Getty Images)

Britain's Catherine, Princess of Wales (R), Britain's Prince Louis of Wales (C) and Britain's Princess Charlotte of Wales (L) attend the "Together At Christmas" Carol Service" at Westminster Abbey in London on December 8, 2023. The event will be broadcast as part of 'Royal Carols: Together At Christmas', a special programme, airing at 7:45pm on ITV1 and ITV X on Christmas Eve. (Photo by Chris Jackson / POOL / AFP) (Photo by CHRIS JACKSON/POOL/AFP via Getty Images)

Britain's Prince William, Prince of Wales (C) Britain's Prince Louis of Wales (2L), Britain's Prince George of Wales (3L), Britain's Princess Charlotte of Wales (4L) and Britain's Catherine, Princess of Wales (2R) leave after attending the "Together At Christmas" Carol Service" at Westminster Abbey in London on December 8, 2023. The event will be broadcast as part of 'Royal Carols: Together At Christmas', a special programme, airing at 7:45pm on ITV1 and ITV X on Christmas Eve. (Photo by HENRY NICHOLLS / AFP) (Photo by HENRY NICHOLLS/AFP via Getty Images)

Britain's Catherine, Princess of Wales (C), Britain's Princess Charlotte of Wales (L) and Britain's Prince George of Wales (R) arrive to attend the "Together At Christmas" Carol Service" at Westminster Abbey in London on December 8, 2023. The event will be broadcast as part of 'Royal Carols: Together At Christmas', a special programme, airing at 7:45pm on ITV1 and ITV X on Christmas Eve. (Photo by Chris Jackson / POOL / AFP) (Photo by CHRIS JACKSON/POOL/AFP via Getty Images)

Britain's Prince William, Prince of Wales (L) Britain's Prince Louis of Wales (2L), Britain's Prince George of Wales (4L), Britain's Princess Charlotte of Wales (3L) and Britain's Catherine, Princess of Wales (C) are greeted by The Dean of Westminster, David Hoyle (R) as they arrive to attend the "Together At Christmas" Carol Service" at Westminster Abbey in London on December 8, 2023. The event will be broadcast as part of 'Royal Carols: Together At Christmas', a special programme, airing at 7:45pm on ITV1 and ITV X on Christmas Eve. (Photo by HENRY NICHOLLS / AFP) (Photo by HENRY NICHOLLS/AFP via Getty Images)

Britain's Catherine, Princess of Wales (C), Britain's Princess Charlotte of Wales (L) and Britain's Prince George of Wales (R) arrive to attend the "Together At Christmas" Carol Service" at Westminster Abbey in London on December 8, 2023. The event will be broadcast as part of 'Royal Carols: Together At Christmas', a special programme, airing at 7:45pm on ITV1 and ITV X on Christmas Eve. (Photo by Chris Jackson / POOL / AFP) (Photo by CHRIS JACKSON/POOL/AFP via Getty Images)

Britain's Prince William, Prince of Wales (L) Britain's Prince Louis of Wales (3L), Britain's Prince George of Wales (2L), Britain's Princess Charlotte of Wales (5L) and Britain's Catherine, Princess of Wales (4L) are greeted by The Dean of Westminster, David Hoyle (C) as they arrive to attend the "Together At Christmas" Carol Service" at Westminster Abbey in London on December 8, 2023. The event will be broadcast as part of 'Royal Carols: Together At Christmas', a special programme, airing at 7:45pm on ITV1 and ITV X on Christmas Eve. (Photo by HENRY NICHOLLS / AFP) (Photo by HENRY NICHOLLS/AFP via Getty Images)