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20. Hugh Jackman
It is almost impossible to see Hugh Jackman not smiling, except in his movies. If you ever saw an interview with him, you saw this cool, smiling, always upbeat guy who just happens to be one of the biggest Hollywood stars.
People who work with him always say that he is the nicest guy they ever worked with, always working hard and never seeing himself as anything more than just another actor doing his job. He is always relaxed and ready to crack a joke. Probably has to do something with him being an Aussie.
This Aussie also supports a number of charities, giving money and raising awareness of many issues plaguing the world. He is often honored by the charities for the work he does and the money he donates.