It's Always Sunny in Philadelphia stars Glenn Howerton, Rob McElhenney and Charlie Day have co-launched the limited-edition Four Walls whiskey collection in celebration of 'their decades-long friendship built within a bar', with all proceeds donated to the Hospitality Assistance Response of Pennsylvania.

McElhenney commented 'We were shooting Season 15 when bars were shutting down all across America. So we decided to source some really great whiskeys and create something as a tribute to the bar and kick it off by giving back', and Day added 'We learned just how rare and how collectible old Irish whiskey is... and wanted to release it and do something for the people and places that do so much for all of us - the bars and the bartenders'.