Beyoncé has been added to the bill for the [article id="1630013"]"Hope for Haiti Now: A Global Benefit for Earthquake Relief"[/article] telethon, airing Friday at 8 p.m. ET/PT, upping the star wattage for the already massive event.

Music performances from "Hope for Haiti Now" will be available for purchase and download on the iTunes Store. Beginning on Friday, iTunes customers will be able to exclusively pre-order both the Hope for Haiti Now full performance album ($7.99) and the full two-hour video telecast ($1.99). Pre-orders will be delivered in the days following the telethon. Individual audio performances will also be available for purchase and download for 99 cents each in the days following the telethon. Apple, the record labels and the artists will donate their share of the proceeds to Haiti relief funds managed by "Hope for Haiti Now" charities.

The singer will join husband Jay-Z, Rihanna and U2's Bono and The Edge in London to help raise funds for Haiti in the wake of last week's devastating 7.0-magnitude earthquake. Justin Timberlake, Bruce Springsteen, Taylor Swift, Mary J. Blige and more artists will also perform during the two-hour telecast.

[article id="1629908"]George Clooney[/article], who helped organize the event with MTV Networks, will helm the proceedings in Los Angeles, while Wyclef Jean and CNN's Anderson Cooper will join in from New York and Haiti, respectively.

A number of notable acts have confirmed their participation for the telethon, which will air commercial-free across MTV, VH1, ABC, CBS, NBC, FOX, CNN, BET, the CW, HBO, CMT, PBS, TNT, Showtime, Comedy Central, Bravo, E! Entertainment Network, National Geographic Channel, Oxygen, G4, Centric, Current TV, Fuse, MLB Network, Epix, Palladia, SoapNet, Style, Discovery Health and Planet Green. Canada's CTV, CBC Television, Global Television and MuchMusic also will air "Hope for Haiti," as will BET International, CNN International, National Geographic and MTV Networks International, making the event available in 640 million homes worldwide.

Facebook and Twitter are the official social-media partners for the telethon. All donations will benefit Oxfam America, Partners in Health, Red Cross, UNICEF and Wyclef's Yele Haiti foundation. The Clinton Bush Haiti Fund and United Nations World Food Programme will also benefit from the telethon's efforts, as aid will be split evenly among each organization's relief programs for the ravaged island.

Expected highlights from the telecast include [article id="1630021"]U2's Bono and The Edge joining Jay-Z and Rihanna[/article] in London for a one-of-a-kind performance. Kid Rock, Keith Urban and Sheryl Crow are among those who will appear in Los Angeles, and Springsteen, Blige and Shakira are set to take part in the New York portion of the show.

Learn more about what you can do to help with [article id="1629607"]earthquake-relief efforts in Haiti[/article], and for more information, see Think MTV. Join George Clooney and Wyclef Jean for [article id="1629832"]MTV's "Hope for Haiti" telethon[/article], airing commercial-free Friday, January 22, at 8 p.m. ET.

[This story was originally published on 1.20.10 at 7:31 p.m. ET]