Lily Allen, Kanye West and Natasha Bedingfield are among the latest stars who've agreed to play a concert being organised by Princes William and Harry.
They're staging the Wembley Stadium gig in memory of their mum, Princess Diana, who died in a car crash 10 years ago.
Last year, the first set of tickets for the 1 July show were snapped up within 20 minutes of going on sale but another 10,000 are being released on Friday.
The gig will also feature big name acts like Joss Stone and Pharrell Williams.
The Princes have chosen bands they think their mum would have liked
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Kids under 12 have been told they should go with a parent or guardian.
The concert is being held on what would have been Princess Diana's 46th birthday and William has said he wanted the concert to be "the best birthday present" his mother ever had.
The line-up includes new bands they think their mum would have liked as well as some of her favourite acts, like 1980s stars Duran Duran.
Charities
The concert will raise money for several of Diana's favourite charities as well as two of the princes' own charities - Centrepoint and Sentebale.
A memorial service for family and friends will be held on 31 August, exactly 10 years to the day after Diana's death.