Tom Hanks, Gabby Douglas to "Stand Up to Cancer"

Gabby Douglas celebrates after she won the artistic gymnastics women's individual all-around final at the London 2012 Olympic Games Aug. 2, 2012.

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(CBS/AP) More A-listers have signed on to support the third Stand Up to Cancer telethon.

Organizers say Tom Hanks, Halle Berry, Justin Timberlake, Sofia Vergara, and Olympic gold medalists Gabrielle Douglas and Missy Franklin will participate in the hour-long TV special. It is set to air Friday on CBS, ABC, NBC, Fox and more than a dozen cable channels.

Pictures: Gabby Douglas

The slate of stars announced Wednesday also includes Eric Stonestreet, Ray Romano, Felicity Huffman, Rocco DiSpirito and Maura Tierney. They'll join previously announced participants such as Julia Roberts, Matt Damon, Michael Douglas, Jessica Biel, Samuel L. Jackson, Jeremy Renner, Seth Rogen, Emma Stone and Gwyneth Paltrow.

Taylor Swift, Tim McGraw, Coldplay and Alicia Keys are set to perform during the special, and patients participating in Stand Up to Cancer trials will share their experiences

Paltrow is an executive producer of the fundraiser that will be carried commercial-free from 8-9 p.m. EDT from the Shrine Auditorium in Los Angeles.

Stand Up to Cancer has raised more than $180 million for cancer research and awareness since the telethon was established in 2008. The organization said it has awarded grants to seven multidisciplinary research "Dream Teams" and to scientists seeking innovative approaches to end cancer's role as the world's leading cause of death.

The telethon features a celebrity phone bank that allows donors who call in to talk with the stars.