Alicia Keys co-founded Keep A Child Alive in 2003 to help African families living with AIDs and to reduce the number of babies born with HIV. Her work has helped spread the word that as little as $1 per day could make a massive difference for a stricken child. The Grammy winner hosts the annual Black Ball to help fund the cause and has made multiple trips to Africa to meet the families that she's fighting for. "By doing this work, a part of my life I didn’t know was missing suddenly started to feel complete," she says in her iVillage blog. "It gave me a purpose that I never want to let go of. There is something indescribable about knowing you're making a difference in just one life."