Sara Paxton was 7 in You're Invited to Mary-Kate & Ashley's Christmas Party when she played the character 'Patty'.
That was over 27 years ago in 1997.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 36, and has starred in 38 movies in total, 37 of those since You're Invited to Mary-Kate & Ashley's Christmas Party was released.
In You're Invited to Mary-Kate & Ashley's Christmas Party, I think Sara Paxton looks: