Dita Von Teese and Katy Perry model their own designs for H&M's Fashion Against AIDS. Photos courtesy of H&M

Whatever Dita Von Teese is selling, we're buying! Could she be any cooler or more glamorous? And forget the shopping guilt; a portion of the proceeds of a "Dita Von Tee" or any of the other celebrity-designed tops go to a very important cause: AIDS awareness.

Today, H&M launches Fashion Against AIDS, for which some of the hottest names in showbiz, including Katy Perry (shown above in her own leotard design), Estelle (who hosted last night's aunch party), Cyndi Lauper, N.E.R.D. and Yoko Ono, collaborated to design 80's-inspired organic cotton T-shirts (or leotards in KP's case); 25 percent of the proceeds will be donated to fighting AIDS.

Singer Estelle was the fashionable host of H&M's launch party. Photo by Astrid Stawiarz, Getty Images

And, as if that weren't enough exciting news for the trendy and affordable retailer, H&M is also opens its 10th NYC store on 86th and Lexington today (May 28) at noon. The first 200 people in line will receive a shopping card valued at up to $300 and an H&M T-shirt. Shoppers will also score an autographed picture of British singing sensation Estelle from the H&M Fashion Against AIDS ad campaign.

"With the purchase of these stylish T-shirts, you can be part of something that makes a huge difference in this pandemic, while looking super-chic." says Von Teese.