Sienna Miller was 18 in South Kensington when she played the character 'Sharon'.
That was over 22 years ago in 2001.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 42, and has starred in 42 movies in total, 36 of those since South Kensington was released.
In South Kensington, I think Sienna Miller looks: