Halle Berry, Jessica Alba, Kate Bosworth, Ellen DeGeneres

AP Photo / Dan Steinberg, Sharkpixs / Zuma Press, Dimitrios Kambouris/WireImage.com, Dimitrios Kambouris/WireImage.com

The upcoming Stand Up to Cancer benefit is beginning to look like the Oscars, the Emmys and the Grammys rolled into one.

I just got word that newlywed Ellen DeGeneres has signed on to work the phonebank during the live telecast of the fundraiser on Sept. 5.

The talk-show pooh-bah isn't the only new name added to the roster...

Halle Berry, Jessica Alba, Kate Bosworth and Rob Lowe will also be answering phones.

And that's just a smidgen of the previously announced participants, who include Christina Applegate, Jennifer Aniston, Charlize Theron, America Ferrera, Meryl Streep, Kirsten Dunst, Julia Louis-Dreyfus, Scarlett Johansson and even Marge Simpson.

The megawatt benefit will be simulcast live and commercial-free from Hollywood's Kodak Theatre on CBS, ABC and NBC (and our very own E!) and cohosted by Katie Couric, Charles Gibson and Brian Williams.

"Just Stand Up," a new single featuring Mariah Carey, Beyoncé, Miley Cyrus, Rihanna and Leona Lewis, among others, also benefits Stand Up and will be available on iTunes starting Sept. 2. Melissa Etheridge is set to perform the song during the telecast.

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