Kristen Stewart was 9 in The Flintstones in Viva Rock Vegas when she played the character 'Ring Toss Girl (uncredited)'.
That was over 24 years ago in 2000.
Today she is 34, and has starred in 58 movies in total, 53 of those since The Flintstones in Viva Rock Vegas was released.
In The Flintstones in Viva Rock Vegas, I think Kristen Stewart looks: