Marisa Tomei, Martin Sheen & Blair Underwood to Guest Next on NBC's WHO DO YOU THINK YOU ARE?

EW.com exclusively reports today that Marisa Tomei, Martin Sheen and Blair Underwood will be the featured actors in the third season of the NBC reality show, Who Do You Think You Are?, premiering in early 2012.  The series traces the lineage of some of the most famous faces today. Previews participants have included Gwyneth Paltrow, Kim Cattrall, Vanessa Williams and more.

"Who Do You Think You Are?" follows celebrities as they embark on personal journeys of self-discovery to trace their family trees. From the trenches of the Civil War to the shores of the Caribbean, and from the valleys of Virginia to the island nations of Australia and Ireland, each episode reveals surprising, inspiring and sometimes tragic stories that are often linked to events in American and international history.

Each week, a different celebrity is taken on a quest into his or her family history. The search is one of surprising and deeply emotional encounters, resulting in one of the most compelling reality formats of recent years. During each episode, viewers will be taken on a personal and often mysterious quest following some of America's best-known celebrities into their ancestral pasts, as they uncover stories of heroism and tragedy, love and betrayal, secrets and intrigue, that lie at the heart of their family history.

From Executive Producers Lisa Kudrow ("Friends," "The Comeback") and Dan Bucatinsky ("Lipstick Jungle," "The Comeback"), in conjunction with their Production Company, Is or Isn't Entertainment, and Shed Media U.S., the series is an adaptation of the award-winning hit British television documentary series from Wall to Wall Productions, created and executive produced by Alex Graham. Jennifer O'Connell and Al Edgington also serve as executive producers.

Photo Credit: Walter McBride/WM Photos