Celebrities turned real-life heroes

Published On: Jan 20 2012 10:58:55 AM CST   Updated On: Sep 30 2014 09:46:02 PM CDT

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
23 / 29
Christopher Polk/Getty Images for MTV

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

Upload Photos / Videos