It was the perfect end to a year which saw them both win All-Ireland medals for their home county in the Ladies' and Men's Football Championships.
They said 'I do' on a crisp morning in Virginia, Co Cavan with a reception in Virginia Park Lodge, surrounded by friends and family.
Fiona looked radiant in a classic lace gown with her bridesmaids pretty in pink.
Among those in attendance were an array of Dublin stars including Darren Daly (who was also best man), Bernard Brogan, Michael Darragh Macauley, Cian O'Sullivan, Stephen Cluxton, Eoghan o'Gara, Paddy Andrews, Cormac Costello, James McCarthy, Con O'Callaghan and Dean Rock.
Dublin ladies stars Niamh McEvoy, who is dating Dean Rock, and Aoife Kane, girlfriend of Con O'Callaghan, were also celebrating with the happy couple.
Among the groomsmen were Paul's brother Fergus, his friend David Killeen, his nephew Cian Daly and Fiona's brother Liam.
Fiona's stunning bridesmaids, meanwhile, included her sisters Karen and Sarah and friends Grace Gibson, Lauren Carroll and Catherine Keaney.
Fiona and Paul have been together for over a decade.
Speaking about the wedding plans to VIP magazine last month, Paul said, “Fiona is definitely more prepared. There’s no question, anything that has been lacklustre in the preparation has been because I was supposed to do it. She has been brilliant, and I’m just kind of taking her guidance.”