It’s been 22 years since the first World AIDS Day, and millions have lost their lives in the battle. Celebrities are working around the clock, flying to foreign countries, starting up charities and doing the tough work to ensure that millions more will live. From Alicia Keys to Mary J. Blige and Jennifer Hudson, take a look at celebs who deserve a round of applause for donning their combat boots and shiny armor to fight HIV/AIDS around the globe.