Dimitrina Dimitrova, a 29-year-old Bulgarian tourist, died on Tuesday after losing her balance and falling off the cliff.
Police said she slipped after she started jumping for joy when her boyfriend proposed to her, local daily Periódico de Ibiza reported.
She was still alive when emergency services arrived but suffered a heart attack soon afterwards and died at the scene.
Witnesses told local police the Bulgarian couple and a group of their friends had gone to Ibiza's Cala Tarida beach to enjoy its renowned sunset views.
An autopsy determined the bride-to-be's death was an accident.