Photos from the coronation show a relaxed Prince Harry and a serious King Charles

King Charles and Prince Harry at the coronation on May 6, 2022.Richard Pohle - WPA Pool/Getty Images

• King Charles III's coronation took place at Westminster Abbey on Saturday.
• The king looked serious and, at times, nervous throughout the historic ceremony.

King Charles offered a brief smile as he entered Westminster Abbey ahead of his coronation ceremony, but his expression turned stoic as he walked inside.

King Charles III arrives at his coronation on May 6, 2023.      Dan Charity - WPA Pool/Getty Image

Prince Harry chatted animatedly with his cousin Princess Beatrice and her husband, Edoardo Mapelli Mozzi, as he entered the abbey.

Prince Harry, Princess Beatrice, and Edoardo Mapelli Mozzi attend King Charles III's coronation.      Dan Charity - WPA Pool/Getty Images

The king's face remained serious as he processed through the abbey.

King Charles III enters his coronation with pages attending him on May 6, 2023.      Yui Mok - WPA Pool/Getty Images

Harry smiled and looked back at Beatrice as he entered the abbey solo.

Prince Harry in Westminster Abbey.      Phil Noble - WPA Pool/Getty Image

The king didn't smile as he looked out at the crowd during the historic event.

King Charles at his coronation on May 6, 2023.      Richard Pohle - WPA Pool/Getty Images

Harry's ensemble also made him seem less formal than other royals in attendance, as he was reportedly asked to wear a morning suit.

Prince Harry at Westminster Abbey.      PHIL NOBLE/POOL/AFP via Getty Images)

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Both King Charles and Queen Camilla bore somber expressions as they sat on their thrones.

King Charles and Queen Camilla on their thrones at the coronation on May 6, 2023.      Yui Mok - WPA Pool/Getty Images

Harry, on the other hand, was spotted smiling as he spoke to his aunt, Princess Anne, ahead of the ceremony.

Prince Harry speaks to Princess Anne at King Charles III's coronation.      Richard Pohle - WPA Pool/Getty Images

Despite the celebratory nature of the day, the king maintained a somber expression.

King Charles at his coronation on May 6, 2023.      Andrew Matthews - WPA Pool/Getty Images

The Duke of Sussex seemed so relaxed at the event that he was photographed making a silly face at one point.

Prince Harry attends King Charles III's coronation.      Richard Pohle - WPA Pool/Getty Images

King Charles didn't smile when the crown was placed on his head, almost 70 years to the day after his mother was crowned.

King Charles is crowned at his coronation on May 6, 2023.      Richard Pohle - WPA Pool/Getty Images

Harry appeared at ease as he watched the ceremony, sitting two rows away from his brother, Prince William.

The royal family attends King Charles III's coronation.      Aaron Chown - WPA Pool/Getty Images