In your opinion, who is the prettiest actress that ever lived?

I would say Grace Kelly.
Also Sharon Stone, Jane Seymour, Vivien Leigh, Kate Beckinsale, Keira Knightley

Vivien Leigh for me.

I'd have to say Blake Lively
Also Grace Kelly, Amanda Seyfried, Ashley Benson, Nina Dobrev, Sasha Pieterse, Natalie Portman, Holland Roden, Sophia Bush

Emma Watson

Alexandra Daddario is plain and overrated. My answer is Emma Watson

Valerie Bertinelli

Anne Hathaway.

Audrey Hepburn. No contest imo simple natural beauty and beautiful heart just look at her innocent face. Plus very intelligent. Classy and the definition of elegance. An elegant beauty.. enough said
Second Tuba Büyüküstün look her up. Natural beauty
The most beautiful actress alive. Seriously look her up.
Then Liz Taylor.

Honorable mention Uruguayan Barbara Mori an exotic mix of Japanese Lebanese Basque Uruguayan. And Mexican maybe..? Look her up too

1 Audrey
2 Tuba
3 Elizabeth

Lana Parrilla.