Tori Kelly hospitalized for blood clots around vital organs.

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Sources say the situation is "really serious."

Incident occurred during dinner with friends in downtown L.A.

Tori passed out and was unconscious for a while.

Friends took her to Cedars-Sinai hospital for treatment.

Doctors found clots in her legs and lungs.

Still determining if any clots are near her heart.

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Tori receiving care in the ICU.