George Clooney joins US telethon
George Clooney, Will Smith and Gwyneth Paltrow have joined an impressive list of stars taking part in the Stand Up To Cancer telethon in the US.
Other celebrities announced on Wednesday include Denzel Washington, Renee Zellweger, Kathy Bates and Richard Branson.
Kareem Abdul-Jabbar, Lance Armstrong and Elizabeth Edwards were previously announced as participants.
Performers will include Green Day's Billie Joe Armstrong, Neil Diamond, The Edge, Herbie Hancock, Lady Antebellum and Leona Lewis.
Queen Latifah, Martina McBride and Stevie Wonder were among those already announced.
George, in particular, is a fundraising heavyweight. At Sunday's Emmy Awards, he accepted the Bob Hope Humanitarian Award for efforts on behalf of victims of this year's earthquake in Haiti, the 2004 tsunami in Indonesia and the September 11 attacks.
Stand Up To Cancer is aimed at raising money to speed up innovative cancer research, according to Spider-Man producer Laura Ziskin, who is a cancer survivor and co-founder of the Stand Up To Cancer group.
The telethon is returning for a second time after the 2008 event helped deliver more than 100 million dollars for research.
Cat Deeley will host a half-hour pre-show available widely online at major network sites as well as other sites and portals including E! Online, Hulu and YouTube.
"A donation of any size brings scientists one step closer to a cure," Ziskin said in a statement.