Hathaway, 32, said the realisation struck her after she was late to an event hosted by her and husband Adam Shulman, reported People magazine.
"My husband and I hosted a screening for Song One, and I said I only needed 10 minutes to get ready. As we were leaving for the screening 20 minutes late, I realised I was wrong. And that I'm 32, and that's not cute anymore," she said.