The 29-year-old revealed that she still has trouble believing that she won the coveted role in Christopher Nolan's The Dark Knight Rises.
"I couldn't believe that this was even an opportunity made available to me and then when I actually got it I, I mean it… it's a little bit too good to be true," Hathaway told Access Hollywood.
"I'm kind of waiting for someone to come out and just be like, 'Psych! You got punked!'"
Hathaway went on to say that she found the character's suit to be daunting.
"It just dominated my thoughts for a year basically," she said. "From the time that I got cast until the last time I wore [the costume]... everything I put in my mouth related back to how it would affect my time in the gym. My time in the gym was dictated by it.
"There's a lot of expectation and I wanted to rise to it."
The actress previously said that she has no complaints about her role as Catwoman in spite of her character's skin-tight costume.
The Dark Knight Rises is released in cinemas on July 20. Watch the trailer below:
Gallery: Catwoman through the years:
Copyright: 20th Century Fox Rex Features