Beyonce, Barbra Streisand and Oprah Winfrey will headline a one-hour benefit telethon to benefit Hurricane Harvey victims that will be simulcast next week by multiple TV channels.
The event will be broadcast live on ABC, CBS, NBC, Fox and CMT at 8pm Eastern time next Tuesday. It is being organised by Houston rap artist Bun B and Scooter Braun, founder of SB Projects.
George Clooney, Jamie Foxx, Matthew McConaughey, Dennis Quaid, Julia Roberts, Kelly Rowland, George Strait, Reese Witherspoon and others will also participate with taped or live messages.
It will benefit several organisations including United Way of Greater Houston, Habitat for Humanity and Save the Children.
Beyonce has previously said she is working with her charity to assist those in her home town affected by Harvey.
The award-winning singer, plus Kelly Rowland and the original members of Destiny's Child who left the group, LeToya Luckett and LaTavia Roberson, formed the band as teenagers in Houston.
Beyonce said she is working closely with her organisation BeyGOOD and her pastor to find ways to help those affected.
The benefit show will also be streamed live on Facebook, YouTube and Twitter.
The telethon will air from Los Angeles, and there will be extra stages in New York and Nashville, Tennessee.
A performance from George Strait's San Antonio benefit concert for Harvey will also be shown.
Other entertainment figures have already pledged to help flood victims. The ABC networks held a "day of giving" last week, and singers Paul Simon and Edie Brickell pledged a million dollars (£770,000).