A Dubliner was brought on stage by popstar Lewis Capaldi to sing his hit song 'Bruises'.
Sean McGrath, 24, took to the Olympia Theatre stage on Thursday night beside the star and stunned the crowd with his voice.
Before they began, Capaldi told Sean: "I'll sing the first line and then it's f****** all yours man."
The Dubliner stepped up to sing and the crowd went wild.
As Lewis paced around the stage cheering on Sean, the crowd are heard singing along with him.
As McGrath had the crowd cheering, Capaldi is seen using the time to take a large sip of his pint of Guinness beside the drum kit.
McGrath, who is the lead singer in a band called Stolen City, told the Irish Mirror: "Nerves actually weren't too much of a problem.
"I'm in a band called Stolen City, so that wasn't really a problem for me, but, I have to say I was very worried that I'd mess up.
"Since Lewis has emerged I've been a massive fan literally from day one when he released Bruises.
"When I walked on stage and saw the three tiers lit up I was in shock more so than anything but I was looked after really well by everyone and the butterflies still haven't gone away.
"Lewis was really friendly. When the crowd screamed for me I basically went into shock.
"I panicked and I looked at Lewis and he goes, 'Keep f****** singing mate'.
"I turned back to the crowd and just embraced it."
The video of Sean's performance has gone viral on social media.
You can check out his band here at Stolen City.
