Have the winners of the Miss Universe contests all been from the same planet?

Which Miss Universe contest?

I think the one on Earth implies theirs have all been human Earthlings, but I don’t think they necessarily know the whole story. And if they did know of a non-Earthling winner, I expect they wouldn’t tell.

As far as we know, that’s true. But a space traveler from another planet or star system could conceivably have studied Earth and trained its representatives to act and appear earth-human.

There is a second contest, by the way, that is similar but only for residents of moons – not planets. That is called the Miss Lunaverse contest.