The ceremony in the 13th century Ashford Castle was billed as the wedding of the year, with the rumour mill in overdrive about which illustrious guests had flown in for the celebrations.
Stevie Wonder is thought to have been the star performer, while the guest list is thought to include Niall Horan of One Direction and Ed Sheeran.
Prior to his performance the Superstitious singer surprised Galway residents by visiting computer shop Compu B on Saturday.
Sales assistant Eoin Healy said staff were stunned when they realised who their customer was.
He said: “I was like ‘Oh my ******* God, it's Stevie Wonder."
“He was so friendly and started talking to me about how beautiful Ireland is even though it's a bit cold.
“He didn't mention anything about the wedding though, but he asked everyone their names and was happy to get into a picture with us.
“He bought two pairs of Apple wireless earphones, a car charger and Bang and Olufsen earphones.”
It is understood that Ms Stoll, a New Yorker, is a big fan of the star.
The exclusive estate, in the village of Cong in Co Mayo, is no stranger to stars from as far back as the 1950s when it was the setting for screen classic The Quiet Man starring John Wayne and Maureen O'Hara.
As helicopters and blacked out cars and SUVs ferried guests to Ashford Castle, a steady stream of locals and tourists traipsed up to the gates in forlorn hope of a sneak peek.
Sadly the four time major winner's representatives insisted the celebrations were a private event and no photographs have yet been released of the big day.
Behind the 12ft walls the ceremony was thought to have included a massive fireworks display, while a more down to earth touch came as a photo booth was brought into the historic venue for guests to create their own memento.
And to avoid any unwanted intrusion past the gatekeepers, the organisers went as far as to bring in anti-drone experts and put security teams on boats on Lough Corrib.
The castle venue, with its 350 acres, nine-hole golf course, horse riding, falconry, fishing and clay pigeon shooting, can be rented for about €100,000 (£83,700) a day at this time of year.
It has been on lockdown since Thursday, with staff and guests asked to wear wristbands for security checks.
Several of McIlroy's Ryder Cup colleagues were spotted arriving, including Spanish Masters champion Sergio Garcia who touched down at Knock airport on Friday.
The bride's family arrived on Saturday by helicopter.
Ryder Cup 2014 captain and longtime friend Paul McGinley is also rumoured to have been seen in the town.
McIlroy revealed in a recent interview that he was friends with Ms Stoll before romance blossomed.
She was credited with getting the star to the first tee on time for his singles match in the 2012 Ryder Cup "Miracle in Medinah" after he missed his alarm.
For anyone wondering what a multi-millionaire golf star has in mind for a honeymoon, McIlroy said he was planning something in "the middle of nowhere".
Locals have been hoping to capitalise on the latest celebrity to descend on the area.
Gerry Collins, founder of the village's The Quiet Man Museum and a film location walking tour company, wondered if the newlyweds might use the golf course to recreate the scene in the film when O'Hara was flung on to the bed, only for it to break.
Mr Collins said: "That'd be a great start to a wedding and married life wouldn't it?"
He added: "This would remind you of 1951 when John Wayne stepped off the train in Cong, or Ronald Reagan in 1984.
"There's a big buzz around Cong but we don't know anything, it's just what we can see out the window."
McIlroy, from Holywood, Co Down, revealed in a recent interview that he was friends with 29-year-old New Yorker Ms Stoll before romance blossomed.
The pair met while she worked for the US PGA and lived in Palm Beach, Florida.
She was credited with getting the 27-year-old star to the first tee on time for his singles match in the 2012 Ryder Cup "Miracle in Medinah" after he missed his alarm.
Not to miss an opportunity the ladies from Ballinrobe Golf Club dropped by to follow-up on an invite for McIlroy to play their course. They did not get far on their mission and have yet to get a reply.
"We sent it to his wedding planner in February but we still hope at some stage that he will take up the offer, and he would be an honorary life member," said Breege Costello.
And for anyone wondering what a multi-millionaire golf star has in mind for a honeymoon, McIlroy said he was planning something in "the middle of nowhere".