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2011 • 8 Episodes
Season 1 of Who Do You Think You Are? premiered on January 2, 2011
2013 • 8 Episodes
Season 2 of Who Do You Think You Are? premiered on January 1, 2013
2015 • 8 Episodes
Season 3 of Who Do You Think You Are? premiered on January 1, 2015
2017 • 8 Episodes
Season 4 of Who Do You Think You Are? premiered on January 1, 2017