Kiersey Clemons was 18 in Prom?! when she played the character 'Abby'.
That was over 11 years ago in 2013.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 30, and has starred in 27 movies in total, 22 of those since Prom?! was released.
In Prom?!, I think Kiersey Clemons looks: