That was over 20 years ago in 2002.
Today she is 31, and has starred in 48 movies in total, 43 since Panic Room was released.
In Panic Room, I think Kristen Stewart looks:
Panic Room scores 6.6 out of 10 on The Movie Database.
Kristen Stewart's first acting role was as 'Girl in Fountain Line (uncredited)' in The Thirteenth Year, released in 1999 when she was 9.