Comedian Amy Schumer and her Trainwreck director Judd Apatow became the unexpected guests at one couple’s Dublin wedding party on Friday. The pair stumbled upon the celebrations of bride Eithne McAdams and her groom J.P. Swine while out and about in the Irish capital and decided to join the party, even indulging in a traditional sing-song.

Schumer and Apatow, who were joined by Irish singer-songwriter and Once star Glen Hansard, wandered into Grogan’s bar in the city centre where the party was just beginning for the happy couple.

More: Amy Schumer’s Summer Fun Continues, Comedienne Dances To ‘Backstreet Boys’ On Board Luxury Yacht

Stunned wedding guests were all too happy to document the events on Twitter as the famous wedding-crashers got in on the festivities. “Who shows up for @jpswaine and Eithne’s wedding only @amyschumer Glen Hansard and Judd Apatow,” tweeted guest Steve Cummins, who also provided a pic of the pair posing with the bride and groom.

Another guest Warren Swords added, “Amy Schumer, Judd Apatow and Glen Hansard are having a sing song in Grogans at the moment.” Schumer and Apatow were said to have joined the couple for a rendition of ‘The Auld Triangle’.

More: Amy Schumer Responds to Open Letter About 'Trainwreck' Theatre Shooting

Schumer has been busy promoting her movie Trainwreck overseas this week, before it opens in the UK on August 28th. The film has so far taken $91.1 million at the US box office and has received positive reviews from critics, earning an 85% rating on Rotten Tomatoes.

Watch the trailer for Trainwreck below: