Julia Roberts, Tom Cruise, Bruce Springsteen, and Cameron Diaz will participate in Friday's simulcast
Julia Roberts
Credit: Julia Roberts: Fitzroy Barrett/Globe Photos

Such A-list stars as Tom Cruise, Julia Roberts, Cameron Diaz, and Will Smith have signed on for ”America: A Tribute to Heroes,” Friday night’s unprecedented live fundraising simulcast, which ABC, CBS, Fox, and NBC are underwriting. Joining Tom Hanks, Jim Carrey, George Clooney, and Bruce Springsteen, who had previously confirmed their participation, will be Bon Jovi, Mariah Carey, Sheryl Crow, Celine Dion, the Dixie Chicks, Robert DeNiro, Clint Eastwood, Faith Hill, Billy Joel, Alicia Keys, Tom Petty, Paul Simon, Robin Williams, Stevie Wonder, and Neil Young.

Manning the phones at a telethon will be celebrity operators Cindy Crawford, John Cusack, Danny DeVito, Goldie Hawn, Salma Hayek, Jack Nicholson, Al Pacino, Brad Pitt, Chris Rock, Meg Ryan, Adam Sandler, and Sylvester Stallone.

Each network is also supplying two stars: Dennis Franz and Sela Ward from ABC, Amy Brenneman and Ray Romano from CBS, Calista Flockhart and Jane Kaczmarek from Fox, and Kelsey Grammer and Conan O’Brien from NBC. Veteran events producer Joel Gallen (”The MTV Movie Awards” is serving as executive producer.) The show will originate from undisclosed locations in Los Angeles and New York.

UPN and the WB will join the other four broadcast networks in airing the show. Cable networks that have agreed so far to carry the event include E!, Fox Movie Channel, FX, Lifetime, MTV, National Geographic Channel, SoapNet, Telemundo, TNT, and USA. The performance will also be webcast on Yahoo!

The show will air live and commercial-free from 9 to 11 p.m. EDT (8 to 10 CDT) and on tape delay in other time zones. The WB will push back Friday’s season premieres, already rescheduled once since the disaster, and it will ask its local carriers to push back their 10 p.m. newscasts, as will UPN and Fox. ”America”’s telethon will raise money for the families of the victims.