Ireland's new laws on gay marriage will be enacted by the end of July, with the first ceremonies likely in the autumn.
The country becomes the first in the world to bring the change in by popular vote, with 62 per cent of the electorate backing it.
Irish Prime Minister Enda Kenny today said the country's voice had been heard "loudly across the world" after it voted in favour of gay marriage in a national referendum.
He said: "With today's vote we have disclosed who we are - a generous, compassionate, bold and joyful people.
"Yes to inclusion, yes to generosity, yes to love, yes to equal marriage."
Almost two-thirds of voters backed a change in the constitution in the referendum.
ITV News Correspondent Duncan Golestani reports:
Ireland's new laws on gay marriage will be enacted by the end of July, with the first ceremonies likely in the autumn.
Ireland's overwhelming support for gay marriage is a message to the world, UN secretary general Ban Ki-moon said.
Billie asked girlfriend Kate to marry her at a count centre in Limerick moments after the result was announced.