Britain's King Charles III attends Easter church service

Britain's King Charles III attended an Easter church service on Sunday, in his most high-profile public appearance since revealing a cancer diagnosis earlier this year.

Charles and his wife, Queen Camilla, arrived by car for the hour-long late morning service at St George's Chapel within the grounds of Windsor Castle, west of London. The 75-year-old, dressed in a suit and light blue tie, smiled and waved to crowds -- who had queued up for hours for a glimpse of the ailing monarch -- before he entered the chapel. Leaving the service, Charles and Camilla greeted some of the well-wishers lined up outside, shaking hands and briefly chatting to some in the crowds. Attending the annual religious ceremony is a long-standing annual tradition for the royals, with other family members in attendance Sunday.