Julia Roberts recently appeared on PBS' Finding Your Roots with Henry Louis Gates, Jr., and what she discovered about her family history left her speechless.

After tracing her family tree, Gates Jr. revealed a shocking secret – the man who was believed to be her great-great-grandfather, Willis Roberts, actually died before her great-grandfather was born. Confused, Julia asked if she was not a Roberts. Gates Jr. explained that public databases revealed a cluster of matches linking Julia, 55, to a man named Henry McDonald Mitchell Jr. So, it turns out that Julia's biological name is Julia Mitchell.

But the surprises didn't end there. Gates Jr. revealed that Mitchell was married when he had an affair with Julia's great-great-grandmother, Rhoda. In fact, Mitchell had six children of his own. It was also discovered that Mitchell's mother, a widow, lived just a few households away from Rhoda. Julia could only manage to say "Wow" as her true family history was revealed before her.

In the end, while Julia was blown away by the unexpected turn, she still preferred to identify as a Roberts.

Gates Jr. concluded that Mitchell seemingly vanished from the records in the late 1800s, but both Julia and Mitchell's newfound ancestors can be traced back to 18th-century colonial Virginia.

This revelation about Julia Roberts is just the latest scandalous discovery on the show. In the premiere episode, Edward Norton learned that he is a descendant of Pocahontas. It was also revealed that Norton and Roberts share a common ancestor, leaving both actors laughing with surprise.