Prince Louis, who stole the show at Saturday's coronation, is not in attendance at the Sunday night coronation concert at Windsor Castle.

William and Kate are attending the concert with their two oldest children, Prince George, 9, and Princess Charlotte, 8.

Louis has become a crowd favorite thanks to his lively personality at recent royal events, from last year's Platinum Jubilee to Saturday's coronation of his grandfather.

Charles and his wife Camilla were greeted with big cheers Sunday as they arrived at the coronation concert in Windsor, England.

The newly-crowned king and queen got a rousing three cheers from the crowd as they stood in the royal box.

Seated with Charles and Camilla are members of the royal family, including Prince William and Kate, the Princess of Wales, and their two oldest children.

Actor Hugh Bonneville, the concert's host, opened the show by recognizing Charles' "lifelong passion for the arts." Bonneville got a quick laugh from Charles when he referred to the king as "the artist formerly known as prince."

Saturday's coronation service saw Charles's and Camilla's crowning moment, but the coronation festivities are continuing.

On Sunday, people across the U.K. will gather for coronation celebrations in a movement known as "The Big Lunch."

Later in the evening, at 3 p.m. EST, a star-studded coronation concert will be held on the grounds of Windsor Castle.

Katy Perry and Lionel Richie are among the stars scheduled to perform, along with Andrea Bocelli, British pop group Take That, Welsh bass-baritone Sir Bryn Terfel, singer/songwriter Freya Ridings and classical-soul composer/producer Alexs Ffrench.

Perry and Richie both also attended Saturday's coronation service at Westminster Abbey.

Prince Louis, the youngest child of Prince William and Kate, stole the show once again at his grandfather's coronation.

Louis, 5, joined his parents and siblings, Prince George, 9, and Princess Charlotte, 8, and other royal family members of the balcony of Buckingham Palace following the coronation service.

The youngster went viral on social media with his funny antics as he watched a military flypast zoom overhead.

Earlier, inside Westminster Abbey, Louis was seen alternatively yawning and looking around inquisitively as the pomp and circumstance of the coronation service played out before him.

Following the service, Louis joined his family inside a carriage in the procession back to Buckingham Palace.

Sitting by a window, Louis was seen waving and looking out at the crowds gathered to watch his family's historic day.

Anti-monarchists are expected to stage large-scale protests in London on Saturday, despite warnings from authorities and a controversial new law.

More than a thousand people will be protesting in Trafalgar Square, according to Republic, a London-based campaign group advocating to replace the British monarchy with an elected head of state.

Meanwhile, London's Metropolitan Police Service said it will have more than 11,500 officers on duty Saturday, making it "one of the most significant and largest security operations" that the agency has led.

Under a new law that went into effect this week, protesters who block roads and railways could face up to 12 months behind bars and a fine, and police will be empowered to stop and search protesters suspected of having intent to commit an offense.