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Singer Katy Perry takes selfies with guests during the coronation of King Charles III and Queen Camilla on Saturday. She is scheduled to perform at a special "Coronation Concert" on Sunday as part of celebrations being held across Britain. Photo: Reuters

King Charles will attend a music concert featuring the likes of singers Lionel Richie, Katy Perry and Andrea Bocelli at Windsor Castle on Sunday after street parties are held across Britain as part of celebrations to mark his coronation.