The celebrities and famous faces spotted at the King's coronation ceremony including Ant and Dec, Katy Perry and Dame Joanna Lumley

American Idol might be the last show we’d expect to share a synergy crossover with the coronation of the next British monarch, but here we are!

Lionel Richie and Nicole Scherzinger are putting on a fabulous show!

The Prince and Princess of Wales have given royal watchers a peek behind the curtain of the Coronation concert with a stylish video, which also revealed a top-secret after-party. William and Kate's social media accounts shared the clip after they and other members of the royal family partied the night away to the sounds of music legends like Lionel Richie, Katy Perry, and Take That at the star-studded Windsor event .They wrote alongside: "A night to remember at the #CoronationConcert." In a cute moment, Princess Charlotte and Prince George enthusiastically waved their flags and grooved to the music.

Katy Perry has revealed she spent the night in Windsor Castle ahead of delivering a spectacular performance at the King’s Coronation concert.The US singer, 38, gave electric renditions of her hit tracks 'Roar' and 'Firework' at the celebratory event held in the grounds of the castle on Sunday evening, dedicating the latter to the King in honour of the work they do together with the British Asian Trust and their Children’s Protection Fund. Dressed in a glistening, metallic-gold, voluminous ballgown which featured a train and matching sleeves, she made a dramatic entrance by walking out singing the opening lyrics to 'Roar' as a drone projection of a lion’s head graced the sky above her.The upbeat pop song was enjoyed by Princess Charlotte who could be seen singing along with the American pop star, next to her mother the Princess of Wales, who swayed along to the song.The performance was accompanied by a dazzling light display which lit up the audience and the sky.

King’s Coronation, everything had to be meticulously planned. But despite months of preparation and a mostly-smooth service, there were a few mishaps along the way. King Charles III and his wife Queen Camilla were crowned during the two-hour service, led by the Archbishop of Canterbury.

Princess Kate and Prince William were in great company Sunday for King Charles III coronation concert at Windsor Castle. Their two eldest children, Prince George and Princess Charlotte, appeared to be having a blast while sitting in the royal box to watch the show with 20,000 revelers. The family cheered along as Nicole Scherzinger took the stage to sing before Katy Perry and Lionel Richie performed for the new king and queen.

Sarah Ferguson finally made her appearance in King Charles' Coronation celebrations on Sunday as she joined ex-husband Prince Andrew for the star-studded Windsor Castle concert. The Duchess Of York, known as Fergie, wasn't in attendance for the Windsor Castle Coronation ceremony just a day prior, after revealing that she didn't get an invite to the occasion. Fergie was married to the disgraced Duke of York for 10 years before their divorce in 1996 and they had two daughters together - Princess Beatrice and Princess Eugenie.

Katy Perry is bringing the fireworks!

Prince William paid a touching tribute to his father King Charles telling the newly crowned monarch 'pa, we are all so proud of you'.

Katy Perry was a regal firework duringKing Charles III's coronation concert!On Sunday, the judge took the stage for a performance in honor of the new king at Windsor Castle. For her set, Perry performed her hits, «Roar» and «Firework.»Starting things off the castle's steps, Perry was shined bright as ever in a big gold ballgown as she made her way to center stage.The royal family got in on the fun, with  Prince William and Kate Middleton's daughter, Princess Charlotte adorably singing along. Before singing «Firework,» Perry addressed the crowd and thanked the newly crowned king and queen for allowing her to be there but also for the work she's been able to do on behalf of the crown via the British Asian Trust and their children's protection fund.«Thank you for bringing out the firework in so many young people,» Perry said.Ahead of the special concert, Perry dished to ET about the opportunity to have a part in the festivities. «I'm grateful I get to go.

King Charles III and Queen Camilla have arrived.

King Charles III and Queen Camilla have arrived.On Sunday, the newly-crowned royals got a royal welcome as the trumpets sounded from the stage and they were spotted arriving at their seats inside the grounds of Windsor Castle.Charles and Camilla — who arrived earlier than expected — were greeted with cheers and applause from the over 20,000 attendees inside the venue.As they made their way, Kate Middleton and Princess Charlotte curtsied as a sign of respect. Also joining them in the box were Prince William and Prince George, as well as other immediate members of the family.The royals had mini Union Jack flags to wave as they took in the show.Sunday's coronation concert is shaping up to be a big event.

King Charles is said to have acknowledged his stateside grandchildren during a speech at his post-Coronation family lunch, wishing grandson Archie a happy birthday. The new monarch's London Coronation fell on the same day as the little one's fourth birthday, with Harry rushing back to the US straight after the ceremony to celebrate his eldest's milestone.

Over 67,000 Big Lunch events will take place around the country this weekend in honour of the Coronation of King Charles and Queen Camilla. And getting into the spirit of the joyous weekend, some members of the royal family have stepped out today to attend some of the events. The Duke and Duchess of Edinburgh headed to Cranleigh in Surrey for a 'Big Lunch' and greeted the crowds, many of whom were waving Union Jack flags.

Around 2,000 guests were inside Westminster Abbey on Saturday to witness the coronation of King Charles III and his wife Queen Camilla. World leaders, foreign royalty and members of the public attended the historic event.

Singing sensation Katy Perry left Royal fans in stitches after seemingly being unable to find her seat during Saturday's celebrations for King Charles's Coronation.

An Oldham man stood just metres away from King Charles III as he was on his way to being crowned at the Coronation today. Proud family and friends snapped pictures of Afruz Miah when he appeared on their screens as one of the 2,000 people invited to witness the King’s Coronation inside Westminster Abbey.

King Charles's coronation, including foreign royals, world leaders and more. Prince Albert and Princess Charlene of Monaco were among the first royals to confirm their attendance for the historic occasion in London. The couple will be joined by a number of royals from households from around the world, including King Carl XVI Gustaf and Crown Princess Victoria of Sweden, Crown Prince Frederik and Crown Princess Mary of Denmark, and King Felipe and Queen Letizia.

A truly A-list event. Celebrities including Lionel Richie and Jill Biden attended King Charles III‘s coronation ceremony at Westminster Abbey in London on Saturday, May 6.

First Minister Humza Yousaf has been spotted wearing a kilt as he attended the Coronation ceremony of King Charles III.