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.
Sinn Fein President Gerry Adams has said he thinks that Ireland's referendum vote on gay marriage marks "a huge day for equality."
Speaking on Sky News he said: "I think this is a huge day for equality.
"I also think that given that the government parties were pressing quite rightly for equality in this issue then we need equality in other issues - we need equality in social issues, economic issues we need everything to be equality. So this is a hugely important day for the LGBT community and everybody else."
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.