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Shiva Devine and Conall McAllen, both in their twenties, died after the vehicle was thrown into a wall in the early hours of Sunday morning.
Shocking photos showed a blue Peugoet 306 car with severe damage to the front and back.
An eyewitness said: "It was horrible to just see all those young people there.
"The car was a total wreck and there were pieces of debris everywhere.
Two other people in the car, a woman and two men aged twenty, have suffered serious injuries and are being treated in the hospital.
The Garda police arrested a man after the crash, but he has now been released without charge.
The grandeur took place in the seaside resort of Bundoran, Co Donegal, north-west Ireland.
The picturesque town surrounded by surf spots is popular with British and Irish holidaymakers.
Testimonials were paid to Shiva and Conall who both lived in Co Fermanagh, Northern Ireland, but Shiva originally came from Donegal.
One said that Conall was fond of rural life and had a lot of time for people & # 39 ;.
Another said: "Shiva was delicious inside and out, and she always had a smile on her face.
"She was kind and thoughtful and very popular."