Hmm, . . . "Hottest Woman of All Time"?
"All Time"? This question is very difficult to answer. DonDiego is likely one of the more senior members of the LVA Fora, . . . but even he cannot claim to have been around for "all time". Forget Cleopatra, and even Jenny Lind, . . . DonDiego has a difficulty judging the hotness of even some 20th Century women, like Theda Barra or Clara Bow.
So, he will just have to limit his candidates to those who have lived during his lifetime, . . . like most other posters are seeming to do.
But more than that, . . . DonDiego came of age, . . . if the reader knows what that means, . . . in the 1960's. So his judgement of hot women was likely at its peak, . . . or if not his "judgement", something was at its peak, . . . and it had to do with hormones ! ! !
So, DonDiego's hottest women candidates are, not surprisingly, from that era.
But first, what's all this fuss over Jennifer Anniston? She wasn't even the hottest woman on
Friends. Enough !
So, . . . OK, . . . back to the 60's!
First Candidate and 3rd Runner-up: Raquel Welch.

Not only hot, . . . but DonDiego recognized her acting talent too; she was eminently believable as a cave-woman. And she has aged well.
2nd Runner-up: Ursula Andress

Wow ! When Ms. Andress emerged from the Carribean in
Dr. No in 1962, . . . holy-moly! All one needs to know is that DonDiego got excited. She has aged less well, however.
1st Runner-up: Elke Sommer

Perhaps it was her apparent innocence. Perhaps it was her German, . . . or European, . . . elegance. Whatever it was young DonDiego was smitten; he had a crush on Ms. Summer from first sight. In spite of, . . . or possibly
because of her being 8 years older than him, DonDiego just thought she
was the hottest woman of all time. However, the relationship was never consummated. Ms. Sommer is still alive, . . . and still 8 years older than poor old DonDiego; it is unlikely the relationship will be consummated. teechur says so.
OK, . . . so that's the way it was in the 60's. DonDiego was simply an immature fool ruled by his hormones. But with age comes knowledge; with life experience comes appreciation of real beauty and "hotness". So, eventually DonDiego realized the European star he'd not appreciated in his youth was the really truely hottest woman of the 20th century.
The Winner: Sophia Loren
Addendum:
Hey! This is all just in fun. For goodness sake, they're all just movie stars.
The actual hottest woman of all time in DonDiego's life is teechur. And she's 8 years
younger than poor old DonDiego.
That's his story and he's sticking to it.