At the Platinum Jubilee Concert, Prince George and Princess Charlotte are beaming

Kate Middleton and Prince William took their two oldest children, Prince George, 8, and Princess Charlotte, 7, to a star-studded event in front of Buckingham Palace to celebrate Queen Elizabeth II’s Platinum Jubilee. The event was put on by the BBC and was in honor of the Queen’s Platinum Jubilee.

The Duke and Duchess’ three children were all smiles as they and about 20,000 other guests enjoyed music by Adam Lambert and Queen, Rod Stewart, and Diana Ross, as well as performances by Andrew Lloyd Webber, Lin Manuel Miranda, and the London casts of Hamilton, The Phantom of the Opera, The Lion King, Six, and Joseph and the Technicolor Dreamcoat, the latter of which featured one of the show’s most famous past leads, Jason Donovan.

During the show, dubbed the Platinum Party at the Palace, George and Charlotte, as well as their parents, waved small British flags.

As Lambert and Queen performed “We Are the Champions,” the audience was enthralled. The children sang along with Kate and William as Stewart sang a copy of Neil Diamond’s “Sweet Caroline.” The duchess and her daughter were also seen signing and performing “Ain’t No Mountain High Enough” with Ross.

The Queen herself did not attend the program due to mobility concerns, but she did appear in a pre-recorded sketch with the popular children’s character Paddington Bear.

Kate, William, George, and Charlotte visited Cardiff Castle in Wales just hours before the event. The Cambridges met with admirers, including singers and crew members from the Platinum Jubilee Celebration Concert, which was held on the castle grounds later that evening.

The four, as well as their youngest child, Prince Louis, 4, joined the Queen and other royals on a Buckingham Palace balcony earlier this week to watch the Trooping the Color procession, which was held in honor of the ceremonial monarch’s 96th birthday. The event was also part of the Queen’s Platinum Jubilee celebrations, which marked the Queen’s accession to the 70th year.