Did you see that? Chelsea Handler, Zooey Deschanel & Chris O'Donnell found something incredible.

The following is from Ancestry.com

This season, the celebrities on Who Do You Think You Are? have made discoveries both shocking and gratifying. Go along with them from Nazi Germany to the Underground Railroad to the battle that inspired the national anthem.

Watch their fascinating stories online at TLC.com.

Make discoveries like the celebrities.

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