While the coronation is a global event, it is also a family affair.

All eyes will be not just on Charles but also his sons William and Harry, who have faced ongoing tensions. Harry, who now lives in California, is attending the coronation without his wife or children.

Camilla's family is also front-and-center at the service, an unlikely position for her normally private children Tom Parker Bowles and Laura Lopes.

Three of Camilla's grandsons are serving as her pages, while George is serving as a page for Charles.

The coronation of Charles and Camilla marks the first time in British history that a divorced man and divorced woman have been crowned alongside each other, according to ABC News royal contributor Victoria Murphy.

Charles and Camilla are each wearing a Robe of State as they enter Westminster Abbey.

Charles’ robe was worn by his grandfather King George VI at his coronation in 1937.

Camilla’s robe was originally made for Queen Elizabeth II’s coronation in 1953.

Helping to carry Charles’ robe down the aisle at Westminster Abbey is his oldest grandson, 9-year-old George, the second in line to the throne.

"This is a really big moment for Prince George," said ABC News royal contributor Victoria Murphy. "All eyes will be on him because he is there as a future king. He’s not just there supporting his grandfather. He’s there seeing before him what, unless things change, one day he could be at the center of."

Joining George as his fellow pages of honour for Charles are Lord Oliver Cholmondeley, Master Nicholas Barclay and Master Ralph Tollemache.

Princess Anne, Charles' only sister, has joined royal family members at Westminster Abbey to watch her brother's coronation.

Anne and Charles were both alive when their mother was coronated in 1953. While Charles attended the ceremony, Anne did not because she was considered too young at the time.

Anne will play a special role in Charles' coronation, leading the procession back to Buckingham Palace following the service at Westminster Abbey.

As Charles was crowned king, ABC News royal contributors weighed in on the moment.

Robert Jobson said he was feeling "deep pride in my country and the royal family and the clergy."

"Particularly a bit of relief for the king because I thought when the archbishop was trying to get that crown on his head, he was trying a little too hard," Jobson added, with a laugh.

Victoria Murphy commented on how the "mood really shifted."

"It was very solemn, it was quite tense, it felt very serious and then suddenly, it actually feels quite joyous now," Murphy said. "It feels like a moment of celebration."

Sir Peter Westmacott, who previously served as Charles' secretary, said he also felt "a sense of great pride" and is "delighted for my old boss."

"It's a wonderful moment of pageantry and the mixture of humility and service," Westmacott added, "but also the crowning of a monarch in a way that no other country in this world still does or indeed knows how to do as we do."

Ailsa Anderson, who previously served as press secretary to Charles' late mother, Queen Elizabeth II, described feeling "rather emotional about it all."

"However you prepare for something like this, to actually see it has made me swell with pride but also emotional and also proud of my former boss, the Archbishop of Canterbury, who has been faultless in this service," Anderson said. "I think this service is pretty stupendous."

Kristina Kyriacou, who previously served as the communications secretary to Charles and Camilla, said she was "absolutely overjoyed."

"I couldn't be happier. I feel very, very emotional," she added. "This is a king who has worked every second and every hour of the day for the past 60 years. You know, since his teens, he has absolutely worked in public service serving his mother, serving the nation and the commonwealth -- and he deserves this. And I hope everyone understands all the good that he has done and all the causes that he has championed."