Julia Roberts is perhaps one of the most recognizable women in the world -- not that her three kids would know.

The Mirror, Mirror actress (and mom to twins Hazel and Finn, 7, and son Henry, 4) tells the April issue of Vanity Fair that her children with husband Danny Moder have no concept of fame.

"I was on a a crowded street, and somebody noticed me, and then another person noticed. Somebody said as we were walking past, 'Oh, that's Julia Roberts.' We all just kind of kept going, and then Finn said, 'Yeah, my mom's Julia Robinson,'" Roberts recalled. "That's what gives you perspective. It could be Robinson, it could be Johnson, because it has nothing to do with me as a person."

Curious about what life is like for children born into famous families, Roberts talked to her Larry Crowne costar Grace Gummer, daughter of three-time Oscar winner Meryl Streep, 62.

"Grace comes up and goes, 'Gosh, it's so sweet seeing all your kids on the set. It reminds me of when I was little, and I would go see my mom at work.' I asked, 'Were you happy?' Suddenly, I thought, here is a source of information."

"I said, 'How old were you when you realized your mom was Meryl Streep?' She said, 'I think I was probably nine when I put that all together.' I said, 'Were you cool with it?' She said, 'Yeah, it was fine. There was no trauma.' So that was hopeful."

Roberts doesn't just worry about the future of her three children -- she's also concerned with today's up-and-coming actors.

"The business is so different; you can never be that new girl that has that moment of, 'Where'd she come from?'" Roberts tells Vanity Fair. "There's the express elevator and there's rehab. It's so awful; nobody gets a fair trial-and-error period that everybody deserves and everybody needs."