The singer and musician were joined by friends and family at the service before moving onto an evening reception at the five-star Kilronan Castle where Susan McCann, Louise Morrissey, Johnny Brady and Una Healy were among the guests.
Wearing a bespoke gown from Irish designer Geraldine O’Meara, the bride’s brilliant white dress featured a sweetheart corset with thin straps and low back with Pippa Middleton style buttons running into a long trail.
Cliona added her own twist to her wedding day look with some "bling bling."
The handsome groom went for a more smart casual in an outfit from GUY Clothing in Tullamore.
Simon, who proposed to Cliona in front of Lough Ree back in December 2020, had played Shania Twain's hit You're Still the One before he got down on bended knee.
The happy couple had been looking forward to the wedding in order to spend time with their family and friends.
Cliona had preciously told RSVP Magazine: "Everybody says that the day goes really fast, so we’re going to make it an awesome day to remember."
Simon added: "People ask us that quite a bit, and I have to say I’m looking forward to the whole thing.
"I won’t be nervous on the day. I think proposing is a lot more nerve wracking than getting married."
Cliona revealed that it was tricky to whittle down the guest list ahead of their special day as they wanted to invite so many people.
She told RSVP Magazine: "Yeah, we hope people don’t fall out with us [laughs]. It is so hard because we have gotten to know so many wonderful people on the music scene.
"But there has to come a point where you realise things have gotten out of hand. At one point we had 450 people, we would have needed two venues to house everyone!"
Simon added: "It had gone crazy and we had to go back to the drawing board, but now it is just family and close friends. I think we have the right balance now."
He continued: "Proposing entails the 'yes' or 'no' part, after she said 'yes', it is all excitement now.
"We couldn’t wait to get married and we would have been straight into it if the lockdown wasn’t so severe last year. We wanted everyone we loved to be there as well and last year wouldn’t have worked."