The Trainwreck star and producer were in Ireland promoting the film, when they stumbled upon the wedding party of Eithne McAdams and J.P. Swine in Dublin’s Gorgans Pub, E! News reports. The pair quickly joined the fold, sitting down for drinks with the happy couple and their gathered friends and family.
Schumer and Apatow weren’t the only celebs around, however, as Once star Glen Hansard was on hand to serenade the newlyweds and their lucky guests. Schumer did her best to join in on a round of "The Auld Triangle," but for the most part the Comedy Central star stuck to her pint of Guinness.