Well Since Kaiser and Hottt have taken my top two one of my other picks is Julie Newmar, she played the catwoman in the Batman TV series and was hot as!!
Kaiser you bastard! Im a huge Sophia Loren fan for a long time. When she was young, she was simply beautiful. I will go further back, how about Veronica Lake ? She was an actress way way back, she was another classic beauty.
As far as today, its so hard to say but Alyssa Milano with her little overbite, is so fucking hot!!