British Pop Star Rita Ora Collapses During Photo Shoot.

British pop singer Rita Ora -- who had the hit song, "R.I.P." -- collapsed on the set of her photo shoot in Miami Beach today ... and was rushed to a hospital by ambulance according to photographers on the scene.

Rita was treated for heat exhaustion and dehydration.  She's been discharged and Dr. Farcy says she's fine.  Rita was in the middle of a photo shoot for Madonna's Material Girl campaign in Miami when she was taken ill.
Photos show the 22-year old singer/model/actress -- eyes closed -- being unloaded from the ambulance on a stretcher ... attended by emergency personnel.  So far, no word on what may have caused her to collapse.

Ora -- who famously dated Rob Kardashian last year -- was reportedly preparing for her photo shoot on the beach near the SoHo Beach House hotel when she fainted in her makeup trailer.

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