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Jennifer Aniston

Paul Fenton/ZUMA KPA

Jennifer Aniston is ready to take your call.

The actress has just signed on to help work the phonebank during an upcoming benefit for Stand Up to Cancer.

The megafundraiser will be simultaneously broadcast live and commercial-free on ABC, CBS and NBC on Sept. 5...

Other boldfaced names who will be working alongside Aniston include Christina Applegate, Lance Armstrong, Josh Brolin, David Cook, Casey Affleck and America Ferrera.

Stand Up to Cancer, a program of the Entertainment Industry Foundation, is aimed at raising money to speed up cancer research and bring new therapies to patients more quickly.

News anchor powerhouses Katie Couric, Charles Gibson and Brian Williams will join forces and cohost the broadcast from the Kodak Theatre in Hollywood.