The new season of Who Do You Think You Are? premieres Monday, May 21 at 9/8c only on TLC.

Actress Liv Tyler discovers a musician in her line of ancestors.

Get a first look at actress Liv Tyler’s journey.

Actor John Stamos meets with modern Greek historian Katerina Lagos where he learns that his paternal grandfather is listed as an orphan at only age 13.

Actor John Stamos discovers his paternal great-grandfather was murdered in a village in Greece.

Get a first look as actor John Stamos digs into his family history.

Smokey Robinson continues to learn about the surprising path of his maternal grandfather.

Get a first look at Smokey Robinson’s journey of exploring his family history.

First look at Jessica Biel’s journey of learning about her ancestry.

Noah Wyle learns the truth about the demise of his ancestor.

Noah Wyle discovers his ancestor fought in the Battle of Shiloh, one of the bloodiest battles of the Civil War.

A first look at actor Noah Wyle's journey to learn more about his family history.

Jennifer Grey’s ancestors travel to the U.S.

Jennifer Grey discovers her grandfather was a conscientious objector.

Jennifer Grey explains how she remembers her grandfather

Get a first look at Jennifer Grey’s journey on Who Do You Think You Are?

Scott Foley finds a relative who risked his life for one of America’s founding fathers, and an ancestor who suffered unspeakably during one of this nation’s darkest times.

First look at Jessica Biel’s journey of learning about her ancestry.

Katey Sagal has an emotional and insightful meeting with her mother's friend and fellow USO performer.

Katey Sagal gets emotional meeting an old friend of her mother.

As award-winning singer Josh Groban digs into his eight times great-grandfather's successful life in Germany, he has an uneasy feeling. Why did he give it all up?

Katey Sagal reads about her mother's involvement with the USO in an old newspaper.

At Germany's University of Tubingen, where his eight times great-grandfather studied theology, Josh Groban gets a tour of the dining hall and promenade.

Get a first look at Smokey Robinson’s journey of exploring his family history.

Katey Sagal learns more about her family tree and how her Amish ancestors arrived in Pennsylvania.

Josh Groban studies a record book of his eight times great-grandfather's academic career and has fun making a few assumptions about the man's character and style.

Molly Ringwald explores family lore of Swedish royalty, which uncovers her ancestors' harrowing lives and reveals women who suffered through unspeakable tragedies, and one brave immigrant who forever changed her family's fate.

Smokey Robinson continues to learn about the surprising path of his maternal grandfather.

Molly Ringwald explores family lore of Swedish royalty, which uncovers her ancestors' harrowing lives and reveals women who suffered through unspeakable tragedies, and one brave immigrant who forever changed her family's fate.

Actress Angie Harmon begins a personal journey to unlock the mysteries of her ancestors.

Get a first look as actor John Stamos digs into his family history.

Angie learns that her ancestor Michael Harmon reported to one of George Washington's toughest generals. That said, Michael's promotion to corporal was a pretty big deal!