Long was at St Peter and Paul's Church in Limerick to witness Brady wed his long-term partner Kerrie Harris over the weekend, before they headed to the five-star Adare Manor.
And it was there that the Southampton striker showed off his musical talents in front of the newlyweds' assembled guests.
The 31-year-old, who scored two Premier League goals last season, entertained guests to his own rendition of Ed Sheeran's Don't.
His wife, Kayleah, posted a short snippet of his performance on Instagram:
Reading's Paul McShane was the best man, while Burnley midfielder Jeff Hendrick was a groomsman at the lavish wedding. Glenn Whelan, Kevin Doyle, Stephen Ward, Jonny Evans and John O'Shea were also in attendance.
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