Inside the fascinating history of Julia Roberts' family

Julie Roberts has one of the most recognizable names in the world, so she was in for a shock when .

The actress, 55, on the PBS documentary series and discovered that her paternal great-great-grandmother had a love child a decade after her husband's death.

Julia's great-grandfather was given the last name Roberts, but his biological father was actually Henry MacDonald Mitchell Jr. — meaning she should be a Mitchell.

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