He performed at the RDS arena here.
The 23-year-old looked cool and casual when he met the fan, but appeared to mix up the country with Scotland as he donned a pair of red tartan trousers, reports dailymail.co.uk.
Slinging his arm around the fan, named Mark Smith, Bieber smiled and chatted away as though he was an old friend.
In some photographs, Smith can be seen holding his hand over his mouth in disbelief as Bieber was strolling with him on the streets.
Smith is taking part in a Lip Sync Battle fundraiser for Celbridge GAA over the weekend and appeared to be getting some tips from Bieber.
(This story has not been edited by Social News XYZ staff and is auto-generated from a syndicated feed.)
About VDC
Doraiah Chowdary Vundavally is a Software engineer at VTech . He is the news editor of SocialNews.XYZ and Freelance writer-contributes Telugu and English Columns on Films, Politics, and Gossips. He is the primary contributor for South Cinema Section of SocialNews.XYZ. His mission is to help to develop SocialNews.XYZ into a News website that has no bias or judgement towards any.