Genealogy gets some celebrity cache in "Who Do You Think You Are," premiering tonight on NBC at 8.

Each week show tracks the family history of a celebrity. The seven are: Matthew Broderick, Lisa Kudrow (who produced the show), Spike Lee, Sarah Jessica Parker, Susan Sarandon, Brooke Shields and Emmitt Smith.

Although the show seems a rip-off of "Faces of America," the PBS specials Harvard professor Skip Gates has hosted, it's actually based on a British hit.