The Prince and Princess of Wales will play an important role during a two-day state visit from the President of South Africa, which will see King Charles host his first state banquet in honour of Mr Ramaphosa.
The banquet will take place at Buckingham Palace this evening (November 22) and will be the first time Camilla, Queen Consort, and Kate Middleton will don tiaras since receiving their new titles.
Royal expert Ingrid Seward says that the dinner is a "big deal" for Kate, as she and William will be seated at the top of the three-sided table, to support the King and entertain President Ramaphosa.
However, Seward, the editor-in-chief of Majesty Magazine, doesn't think the Princess of Wales will struggle or 'suffer nerves' at the banquet, in the same way her late mother-in-law, Princess Diana, previously did.
She told The Mirror: "The last Princess of Wales did not like state banquets. Diana admitted she cut up her food, moved it around her plate and brought her fork to her mouth a couple of times without taking a mouthful.
"She took the same precautions with alcohol. To make up for her calorie deficiency, she would grab a sandwich or a piece of chocolate afterward.
"Diana could work a room like no one else standing tall and beautiful in her gown and tiara. Once seated she talked politely with guests on either side of her, but she was bored.
"Catherine is very different. She doesn’t suffer the same nerves as Diana and has a higher boredom threshold. Like Diana she is brilliant at making small talk and knows the areas she can discuss and those to avoid. But she doesn’t have that rebellious streak that made Diana want to say outrageous things.
"Catherine has admitted her Language skills 'are so bad’ she veers away from conversing in another tongue. At state banquets that can make things stilted but Catherine will always find a way."
The expert continued to say: "On Tuesday night when as the new Prince and Princess of Wales she and William will be seated at the top the three-sided table.
"They will support the King and Queen and entertain Cyril Ramaphosa and his wife. Catherine will be one side of the President to the King and William will be seated the other side of the President's wife, Tshepo Motsepe.
"It is a big deal for them. Earlier in the day they officially greeted Ramaphosa and his wife at the Corinthia Hotel and escorted them to nearby Horse Guards Parade for the formal ceremonial welcome with the King and Queen. They then were part of the royal carriage procession along the Mall to Buckingham Palace for lunch.
"No one could do it better."