Hundreds of fans gathered outside Dublin's Savoy Cinema to see Ron, Brian Fantana, Brick Tamland and Champ Kind rock up the red carpet.
And the cast certainly laid on the charm for their Irish audience, who were waiting for up to six hours before they arrived shortly before the film kicked off.
Will Ferrell, whose family is originally from Longford, said that he was eager to get back to Ireland as he loves spending time here.
"I'd love to sail around the entire country some day, and be rescued by the Irish Coastguard," he said jokingly.
"If anyone wants to join us after the movie we're all going to swim in the Liffey."
And he told the Irish Independent that he plans to take over hosting duties from Ryan Tubridy on the 'Late Late Toy Show' next year. "He doesn't know yet, but I am," he laughed.
Paul Rudd said that Ireland holds a special place in his heart. "I scattered my father's ashes here, I've been coming here for decades," he said.
"I consider it my home, I never like to stay away too long."
Rudd also spoke about One Direction's Niall Horan, whom the cast joined on 'Saturday Night Live' in the US last weekend. "I'm crazy about Niall, that's one cool kid," he said.
David Koechner, who plays Champ on screen, shouted out to fans: "Ireland is my home."
But it was Steve Carell's first time on Irish shores.
"I hope people like the movie, it definitely has more 'I love lamp' catchphrases," he said.
And celebrity fans were out in force last night -- actor Jack Reynor and Domhnall Gleeson sauntered down the red carpet.
Earlier in the evening the stars of the movie enjoyed a pub crawl in the city centre, including a stopover in Toners on Baggot Street.
They also filmed an interview with Ryan Tubridy for 'The Late Late Show' while in town.