I dunno about "most beautiful person in the world" -- that changes every day, every hour. But just on appearances, for me and it's probably because of when I grew up, there's something about Marlo Thomas circa the "That Girl" days. She's almost 80 now and looks horrific because of cosmetic surgery attempts over the years to hold it all back. But around 1968 or so,
OH MY GOD.
Admit it, she's amazing. Thing is, her voice is annoying as hell and she was a deplorable actress. Just very, very easy on the eyes. (for me anyway)
And oh yeah, runner up Lynda Carter. .... No, Barbara Eden!