Leona Lewis and JLS have confirmed they'll sing on Simon Cowell's charity single to raise money for Haiti.
The song is going to be a cover of the REM classic Everybody Hurts, which was a huge hit back in 1993.
Among the other stars thought to be taking part are X Factor winner Joe McElderry and judge Cheryl Cole, N-Dubz, Robbie Williams and Take That.
Simon and the stars are hoping to make the single in just 48 hours so they can send the money to Haiti quickly.
Simon said: "I'd like to make this record with as many different types of singer as we can and I hope everyone in the industry comes together to get involved.
"The response has been fantastic."
To boost the amount of money raised, the government has also agreed to donate the tax from sales of the single to the fund-raising effort.
Simon Cowell wants as many artists as possible to take part in the single
Prime Minister Gordon Brown said: "Simon Cowell can make a huge amount of money to help the people of Haiti."
And a load of popstars are going to auction things like instruments and clothes online, with all the money going to Haiti.
You could snap up the Arctic Monkeys' guitar, or a jacket worn by Chris Martin from Coldplay.
Chris has visited Haiti before: "It's a country of extreme poverty and brutal living conditions," he said.
"The earthquake that has struck Haiti will have turned the city into an unimaginable hell."