Stewart, who walked the red carpet for the film with co-star Jodie Foster in March 2002, wore a long black trench coat over a dark dress and accessorized the ensemble with black tights and sneakers, reported Us magzine.
"I think the pictures that they took at the premiere of Panic Room. It's like a popular image to show from when I was younger, you know, like 'she was a kid!' And I look at that and I'm like, 'Oh my gosh'.
"It shouldn't be embarrassing because I was so young. But it doesn't even matter how young you are, you're just so, so embarrassed... I had like these little things like poking out from under my hair and behind my ears, and a ridiculous outfit," she said.
"I did not know how to get dressed up at that age at all, I didn't even know what I liked. I was just like completely. A goofy kid," she added.
