From The Hollywood Reporter by Michael O'Connell:
"The second wind for Who Do You Think You Are? will continue on TLC. The cable network announced Tuesday that it's picked up the unscripted series for another 10-episode season.
Exploring celebrity ancestry for a total of 35 episodes by the conclusion of its current run, the TLC season has featured episodes focused on Christina Applegate, Kelly Clarkson, Cindy Crawford, Zooey Deschanel, Chelsea Handler, Chris O’Donnell, and Trisha Yearwood. It concludes Tuesday with an episode following Big Bang Theory star Jim Parsons.
The next season sees the episode order upped from eight to 10. This season has averaged 1.8 million viewers in first runs."
The article can be found here.