Alright, I have come to a conclusion as the best of all time (and this is for celebrities only, so no one in this forum can win).
This might be a little hard to believe, but my pick is the early 1990's version of Rebecca De Mornay. She was around 29-31 at the time and packed a powerful punch in the department in question.
Just watch these 2 movies and tell my why on earth you would disagree:
Guity as Sin (unfortunately Don Johnson is in it, too)
Hand That Rocks The Cradle
The first film shows it off more than the second, but Cradle still has some quality shots.