Ryan Whitney Newman was 7 in Monster House when she played the character 'Little Girl (voice)'.
That was over 18 years ago in 2006.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 26, and has starred in 13 movies in total, 9 of those since Monster House was released.
In Monster House, I think Ryan Whitney Newman looks: