Miss Jamaica’s pageant dreams hit the floor -- literally -- 'cause she just took a wild tumble right off the stage during the Miss Universe prelims!

The video is rough -- Gabrielle Henry was absolutely owning the stage in Thailand in her sparkly gown when she suddenly sashayed right off the edge on Wednesday ... and honestly, we felt that impact all the way from the newsroom🫣.

The force was clearly felt IRL too ... a whole team of what looked like medics rushed her, and she ended up being carried off on a stretcher. No word yet on how she’s doing.

Reports online are saying there was actually a hole in the stage -- which would explain why the fall was so brutal. And it does track, especially since contestants rehearse like crazy and know that stage inside out, so it makes sense she

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