Julia Roberts was shocked to discover that her last name is not actually Roberts, but Mitchell. While exploring her family history on the show Ancestry's Finding Your Roots, it was revealed that her great great grandmother had an affair with a married man after her husband's death. The DNA analysis and genealogical work led to the conclusion that Julia's true last name is Mitchell. Although surprised by the revelation, Julia still considers her family to be her family and prefers the name Roberts.
