The extremely private family, which also includes 16-year-old twins Hazel and Phinnaeus, have been living in Sydney, Australia, for the past few months.
"I don’t think they will ever have a true sense of [my fame]. I think I told you once when they were starting to figure it out, it was like, 'You’re famous?'" Julia told Harper's Baazar.
She continued, "And I said, 'I think a lot of people might have seen the movie that I'm in or might know who I am.' Maybe an hour goes by. 'Are you more famous than Taylor Swift?'"
And while Taylor may be more famous than Julia in the eyes of her children, they've at least gotta be impressed she considers the pop star a friend!