Friel is to play Jean Raymond, the wife of porn baron Paul Bradley, in new movie "The Look of Love". She made the error while trying to send her father images of Jean, reports dailystar.co.uk.
"I sent an email to my dad with some pictures of Jean Raymond. He called me afterwards and said, 'I think you're going a bit far on this one'," she told Easy Living magazine.
"I wondered what he meant and then I realised I'd sent him an email attachment of an actual porn shoot that Jean did - I mean, everything. I was mortified," she added.