Celebrities turned real-life heroes

Published On: Jan 20 2012 08:58:55 AM PST   Updated On: Sep 23 2014 08:13:54 AM PDT

Mike Tyson is the latest in a long list of celebrities who have acted heroically outside the spotlight. Here are some of the other celebrity turned real-life heroes.

Heroes - Rihanna
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Pop star Rihanna has used her Twitter account to help find donors for people who need bone marrow transplants.

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