Think you know all about celebrities? Think again. Some of them barely know their own family history. But seven of America's leading stars of movies, television and sports share their journeys into their pasts in NBC's new TV series “Who Do You Think You Are?”, which started Friday. The show takes former “Friends” star Lisa Kudrow back to the World War Two pogroms - destruction and killing - in Belarus; Actress Sarah Jessica Parker discovers ancestors from the California gold rush; and African American director Spike Lee finds he may have more Caucasian blood than he thought. Actresses Brooke Shields and Susan Sarandon, actor Matthew Broderick and Hall of Fame footballer Emmitt Smith are also featured. Research is done by genealogists and historians, and with the help of popular web site ancestry.com. But the celebrities know little in advance.
