is opening up about the silly side of her that fans don't always get to see.
"I think people are surprised in real life that I'm really silly, but that's fine," Watson tells ET's Carly Steel. "How do say it? 'Under promise, over deliver?' Like, make people think I'm super serious, then I can be like, 'Nah!'"
The 26-year-old actress and her co-star, Dan Stevens, say that they were able to show off some of her sense of humor in Beauty and the Beast
"When sitting down with Emma and talking about the kind of Beast that her Belle might fall in love with, we thought it had to be somebody that loved reading," Stevens explains, "somebody that had a pretty great library…"
"And someone who is funny," Watson adds.
Stevens, 34, revealed that they worked on "tuning up the Beast's humor a bit" for the live-action film.
In addition to Stevens' more humorous Beast, there were also a number of revamps made to Watson's version of Belle. For example, in the 1991 animated movie, Belle is an assistant to her inventor father, but in the 2017 version, she's developing a "modern washing machine that allows her to sit and read." She also wears riding boots to ride horses instead of ballet slippers.
But one thing remains the same: the singing!
"I was convinced that I was Florence Foster Jenkins," Watson says, admitting that she didn't have full confidence in her voice at first. "It took some conversations with myself in the mirror a few mornings. 'Get it together, Watson!'"
Beauty and the Beast opens Friday.