TLC's 'Who Do You Think You Are' Season 5: Cynthia Nixon, Jesse Tyler Ferguson and more

cynthia-nixon-who-do-you-think-you-are-tlc.jpgThe Emmy-nominated docuseries "Who Do You Think You Are?," in which celebrities trace their family histories, returns to TLC for Season 5 with a whole new crop of famous folks ready to discover their families' lineage.

The show, produced by Lisa Kudrow and Dan Bucatinsky, will premiere Wednesday, July 23 at 9 p.m. ET/PT on TLC, and will feature Valerie Bertinelli, Jesse Tyler Ferguson, Lauren Graham, Kelsey Grammer, Rachel McAdams and Cynthia Nixon investigating their families with the help of TLC and Ancestry.com.

Watch a preview below, in which Nixon digs into her father's previously unknown lineage.

Photo/Video credit: TLC