Lily Mo Sheen was 5 in Underworld: Evolution when she played the character 'Young Selene'.
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 25, and has starred in 4 movies in total, 3 of those since Underworld: Evolution was released.
In Underworld: Evolution, I think Lily Mo Sheen looks: