Also contributing:
Hilary Duff donated $200,000 to the American Red Cross and $50,000 to USA Harvest.
Jada Pinkett Smith visited with refugees at the Astrodome.
Celine Dion gave $1 million to relief efforts and will donate proceeds from her Las Vegas show.
Lisa Marie Presley volunteered at a Memphis shelter.
Ricky Martin has teamed up with Banco Popular and the Salvation Army for a collection drive to help victims of Katrina. Banco Popular branches are collecting diapers, clothes and educational toys, to be distributed by the Salvation Army to relief centers in Texas and areas affected by the hurricane.
Rapper Young Jeezy has opened his Atlanta mansion to Katrina disaster victims in need of shelter.
Jack Johnson has pledged a total of $65,000 to Hurricane Katrina relief, drawn from proceeds from recent and upcoming shows. The singer-songwriter will also auction off tickets to upcoming concerts in support of the cause.
The Game is donating his 2005 Bentley Continental GT, worth more than $250,000, to Morgan Freeman's Charity Folks auction to benefit the American Red Cross Disaster Relief Fund.
Prince has released two new tracks, "SST" and "Brand New Orleans," through npgmusicclub.com and iTunes to raise money for Katrina relief.
Louisiana native Britney Spears is donating two grants from her foundation to aid in relief efforts. The first will go to Habitat for Humanity's project Operation Home Delivery, a long-term rebuilding plan for families affected by the disaster. The second will provide the East Baton Rouge School System, which has taken in nearly 7,000 displaced New Orleans students, with supplies, transportation and other materials.