I'll begin with the most obvious choice:
Marilyn Monroe had just about everything going right for her. A sexy, healthy body, a helluva smile, and those eyes...
Jane Seymore, specifically when she played Solitaire in James Bond's Live and Let Die. Without going into too much detail, when I was young, I spent alot of time pausing the movie when her cleavage got shown. If you know what I mean.
Audrey Hepburn did the cute thing so well. Plus, I love her name, and want to name my daughter that if my wife lets me.
Who am I missing (I can think of a few off-hand)? Anything before the 1980s counts!