The couple's engagement news first became public when Beverly Hills jeweller Robert Procop revealed that he helped Pitt, 48, design a custom diamond ring for Jolie, 36.
Jon Voight, 73, says he learned about his daughter's engagement through media and was just as surprised as the rest of the world, reported Us magazine.
"It was very nice I thought. If they are happy -- if they're going to have a wedding -- it's wonderful. They haven't given me any insight into that (marriage). I can't really trust what people say. The newspapers and magazines seem to go their own way, and so I have to get it from Angie," he said.
The "Deliverance" star also said he doesn't talk about their engagement when they meet up.