05/12/2012 11:53 am ET

Henry Louis Gates Discovers John Legends Family History On 'Finding Your Roots'

Henry Louis Gates has unearthed the family origins of many famous faces, from media legend Barbara Walters, to domestic diva Martha Stewart and even former Secretary of State Condoleezza Rice. So it's only right that the Harvard professor invite singer and philanthropist John Legend to dig into his family genealogy on the PBS series "Finding Your Roots With Henry Louis Gates Jr."

The R&B crooner surely has family on his mind, as he prepares to start his own after marrying fiancee Chrissy Teigen, but he takes a step back in time to uncover information about his own family history. On the newest episode of "Find Your Roots," he and comedian Wanda Sykes discover the extraordinary stories of the free black ancestors they never knew about.

Find out what Legend and Sykes learn Sunday night and 9 p.m. on PBS.