27/12/2011 08:46 GMT | Updated 26/02/2012 05:12 GMT

Justin Bieber, Lady Gaga Named Most Charitable Celebrities 2011 By Do Something

They're at opposite ends of the pop spectrum but it turns out that Lady Gaga and Justin Bieber have something in common: in a survey of international celebrities that use their status and wealth to do good. Find out why they took the top spots, and who else made the list.