That was over 19 years ago in 2002.
Today she is 56, and has starred in 64 movies in total, 23 since Unfaithful was released.
In Unfaithful, I think Diane Lane looks:
Unfaithful scores 6.4 out of 10 on The Movie Database.
Diane Lane's first acting role was as 'Lauren King' in A Little Romance, released in 1979 when she was 14.