Erin Moriarty was 17 in The Watch when she played the character 'Chelsea'.
That was over 12 years ago in 2012.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 29, and has starred in 15 movies in total, 13 of those since The Watch was released.
In The Watch, I think Erin Moriarty looks: