AIDS activists top the LooktotheStars.org list of most charitable stars, The Associated Press reports. Annie Lennox heads the list, followed by Elton John, Bill Clinton and Bono. All four are known for their philanthropic work in many areas, but especially in the fight against HIV/AIDS. Other celebrities on the list include George Clooney, Brad Pitt and Angelina Jolie. LooktotheStars.org tracks celebrity charity events worldwide.

To read the article, click here.