Lady Gaga was named the No. 1 most charitable celebrity of 2010, according to the nonprofit advocacy organization Do Something. Alicia Keys came in at No. 2. Both Gaga and Keys are well known for their HIV/AIDS advocacy. Gaga has been a spokesperson for the M*A*C Viva Glam campaign, and Keys is a cofounder of Keep a Child Alive. Other celebrities on this year's list include Taylor Swift, Ashton Kutcher, Demi Moore and Ellen DeGeneres.

For the complete list of most charitable celebrities of 2010, click here.