Watch the Live Stream of STAND UP 2 CANCER Now!

Related: Stand Up 2 Cancer, Zap 2 It

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Tom Hanks, Halle Berry, Justin Timberlake, Sofía Vergara, Eric Stonestreet, Ray Romano, Felicity Huffman, Max Greenfield, Stacy Keibler, Maura Tierney, Rocco DiSpirito, Ethan Zohn and Olympic Gold Medalists Gabrielle Douglas and Missy Franklin will participate in Stand Up To Cancer's landmark event tonight, September 7 (8:00-9:00 p.m., ET/PT). They join celebrities from film, television, music and sports in a nationally televised broadcast which will fund groundbreaking translational research that delivers new therapies to cancer patients quickly and save lives. Watch the live stream on Zap2It HERE!

Executive-produced by Gwyneth Paltrow and Joel Gallen of Tenth Planet Productions in collaboration with SU2C's production team, the 2012 Stand Up To Cancer broadcast will feature previously announced stars Julia Roberts, Matt Damon, Michael Douglas, Jessica Biel, Samuel L. Jackson, Jeremy Renner, Seth Rogen and Emma Stone who will join Paltrow and SU2C Co-Founder Katie Couric. Taylor Swift, Coldplay, Alicia Keys and Tim McGRaw will deliver moving, one-of-a-kind performances alongside inspiring patient stories. Actors and personalities including Simon Baker, Jordana Brewster, Diem Brown, Dana Delany, Chelsea Handler, Marg Helgenberger, Minka Kelly, Joe Manganiello, Jillian Michaels, Masi Oka, Ana Maria Polo and Alison Sweeney will also take part in the broadcast.