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Not only will Taylor Swift perform in L.A., but she's also going to answer calls for the phone bank.
The Obamas may also pitch in with a pretaped message, according to sources.
Avatar star Zoe Saldanawill be a part of the telethon, but she tells us that she's also working with Avon—she's the beauty company's newest celeb face—in helping raise disaster relief funds, which already includes $500,000 to the American Red Cross and Doctor's Without Borders.
Maggie Gyllenhaal told us at the recent BAFTA/LA Tea Party that she immediately called folks at Partners in Health, an organization that she became involved with a few a months ago, when she learned about the earthquake.
"They sent me an email telling me about all the things they are doing on the ground," the Crazy Heart star said. "But they also said, 'What we need right now is financial support—please spread the word!'"
Learn more about the telethon in today's Gossip Guru videoblog.