Queen and Diana Ross will perform at the upcoming star-studded concert to celebrate Queen Elizabeth II's Platinum Jubilee.
Brian May, Roger Taylor and their frontman Adam Lambert will kick off the Platinum Party at the Palace with a performance in front of Buckingham Palace on 4 June.
"Twenty years after playing the Queen's glorious Golden Jubilee we're very happy to be invited again," said guitarist Brian, who famously performed on the palace roof at the 2002 event. "Then there was a moment when I wondered... after (the) Buckingham Palace roof where can you go? Well... you will see!"
The star-studded concert will be closed by the Motown legend, marking her first live performance in the U.K. in 15 years.
"Her Majesty has and continues to be such an incredible inspiration to so many across the world and I was absolutely delighted to receive an invitation to perform on such a momentous and historic occasion," Diana added in a statement.
Other performers include Rod Stewart, Duran Duran, Alicia Keys, Nile Rodgers, Craig David, Hans Zimmer, Mabel, and Eurovision runner-up Sam Ryder. Elton John's performance will be pre-recorded as he is currently on tour.
Composers Andrew Lloyd Webber and Lin-Manuel Miranda will help celebrate musical theatre alongside the casts of The Phantom of the Opera, Hamilton, Six, The Lion King and Joseph and the Amazing Technicolour Dreamcoat.
The extravaganza, which will last around two and a half hours, will also feature appearances by David Attenborough, David Beckham, Stephen Fry, Julie Andrews and tennis star Emma Raducanu.
Around 22,000 people will attend the concert outside Buckingham Palace and it will be broadcast live on BBC One.
