You should do a Google or Bing search for this - you would be amazed at what you will find.
who were all the richest celebrities across the world?
https://en.wikipedia.org/wiki/The_World%27s_Billionaires
Bill Gates is the richest in the world currently and "Gates has put his money where his mouth is. He and his wife Melinda have so far given away $28 billion via their charitable foundation, more than $8 billion of it to improve global health. 18 Jan 2013"
So that's kinda cool...