In real life (all long ago, I never see anyone remarkably beautiful these days!)
Princess Diana - she wasn't classically beautiful although very attractive & perfectly groomed. It was her radiance, for want of a better word. Never seen anything like it, before or since; she kind of emanated loveliness.
Naomi Campbell - I really didn't want to think so, but she was breath-taking. She was just hurrying down a busy street, no makeup as far as I could tell, and perfectly beautiful.
A gardener in Brazil - standing on a wall, shirtless, trimming a hedge. It's a cliché but he really looked like a classical sculpture! Brazil was teeming with beautiful people but, from my five years there, he's the only one who's burned into my memory.
I decided, against all my instincts, not to start a conversation with him. Quite glad I didn't, as it could have spoiled the image 😂 He had a beautiful smile, though!