Once again this year, Designers Against Aids (DAA) has collaborated with H&M to create a collection of t-shirts for AIDS and HIV awareness. Celebrities like N.E.R.D, Katy Perry, Cyndi Lauper, Estelle, Robyn, Tokio Hotel and Dita Von Teese will design shirts for to help fight the disease and raise youth awareness. The custom 100% organic cotton t-shirts will be sold in H&M stores with 25% of the proceeds being donated to AIDS/HIV prevention projects. The shirts will sell in least 1,000 stores in 30 countries. Watch the celebrity designers explain why they joined the cause and what inspired their design for the collection: