Jessica Henwick was 16 in St Trinian's 2: The Legend of Fritton's Gold when she played the character 'Globe Girl'.
That was over 14 years ago in 2009.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 31, and has starred in 22 movies in total, 19 of those since St Trinian's 2: The Legend of Fritton's Gold was released.
In St Trinian's 2: The Legend of Fritton's Gold, I think Jessica Henwick looks: