VIDEO : Jessica Biel Discovers Her Ancestors On 'Who Do You Think You Are'

On a new episode of TLC's popular series Who Do You Think You Are? 35-year-old actress Jessica Biel discovers that her ancestors were Jewish. In a sneak preview video Biel seems shocked and responds with, "Wow, I've never heard of this before in my family," Biel says."That's kind of a big deal to not know about. That sort of changes everything." According to ET, this season, the show will also follow Julie Bowen, Courteney Cox, Jennifer Grey, Smokey Robinson, John Stamos, Noah Wyle and Liv Tyler. Who Do You Think You Are? airs Sunday at 10 p.m. ET/PT, 9 p.m. CT on TLC.