The stars of hit TV show Glee wasted no time in getting to know the capital's hotspots over the weekend.
Revellers at Krystle nightclub found themselves sharing the dancefloor with two of the cast members who turned up unexpectedly.
Cory Monteith, who plays Finn Hudson, and Mark Salling, better known as Noah 'Puck' Puckerman, hit the tiles in style, ahead of their four sell-out shows at the O2.
The high profile pair arrived at the Harcourt Street hotspot shortly before midnight and were mobbed by female fans.
Cory (29), who hails from Calgary in Canada, was in high spirits as he toasted his home country's national day of celebration.
Cory and Mark spent much of their evening posing for pictures and signing autographs for Glee devotees and were keen not to overdo it on the alcohol front ahead of their matinee performance the following afternoon.
"The guys had a great night out. They never left the dancefloor," said an insider. "They had loads of girls coming up to them all night and really seemed to be enjoying all the attention.
"They didn't expect any special treatment and actually spent most of their night downstairs in the main club instead of staying in the VIP suite area where most celebrities chose to party. They weren't too interested in boozing as they had to be on top form for the following day. They were just there to let their hair down."
Earlier that evening, Cory and Mark had joined their co-stars on the show, including Lea Michele, Chris Colfer and Naya Rivera, at the Exchequer bar in the city centre.
The group was shooting a promo for the forthcoming season of the show and caused pandemonium on Exchequer Street as eager fans quickly descended on the area in the hopes of catching a glimpse of their idols.
The Glee crew didn't stay around for long however, departing for their hotel as soon as they were finished with their work commitments.
The gang, who play a choir of misfits at fictional US school William McKinley High, enjoyed a slap up meal at the Four Seasons hotel, where they stayed during their visit.
The performers had originally been due to stay at the upmarket Morrison hotel, in order to be in close proximity to the O2.
Eager 'Gleeks' led to the group's management changing the reservation to the Ballsbridge hotel however, where extra security had to be laid on to deal with the huge crowds of fans.
The Glee stars were due to leave Ireland today after performing their final show last night. They were expected to fit in some sight-seeing this morning before jetting back to the States.