Julia Roberts is not who she thought she was.

The Oscar-winner appeared on PBS’ Finding Your Roots with Henry Louis Gates, Jr. on Wednesday, and was left speechless by a hidden centuries-old secret.

After researching Roberts’ family tree, Gates Jr. discovered that the man who was supposedly her great-great-grandfather, Willis Roberts, actually died more than a decade before her great-grandfather was born.

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While her great-great-grandmother Rhoda Suttle Roberts had been married to Willis since the 1850s, his death in 1864 left a startling gap.

“Oh, wait — but am I not a Roberts?” the Ticket to Paradise star asked as Gates Jr. walked her through his findings.

Read more: yahoo