Rihanna was 17 in Bring It On: All or Nothing when she played the character 'Herself'.
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 36, and has starred in 40 movies in total, 38 of those since Bring It On: All or Nothing was released.
In Bring It On: All or Nothing, I think Rihanna looks: