Celebrities turned real-life heroes

Published On: Jan 20 2012 10:58:55 AM CST   Updated On: Jun 10 2013 07:16:54 AM CDT

John Malkovich is the latest in a long list of celebrities who have acted heroically off the screen. 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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