"It's Always Sunny in Philadelphia" stars Rob McElhenney, Charlie Day and Glenn Howerton have teamed up to create something their characters would be happy to serve at Paddy's Pub: a new whiskey.

Their new Irish American whiskey, called Four Walls, is now available nationwide. The spirit is headed for bars everywhere and can also be ordered online, according to a news release.

A 750 ml bottle of the 80-proof spirit is available for $34.99 and is "made in tribute to the four walls the gang calls home — the bar," according to the website.

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Four Walls Whiskey origin story

The spirit was initially sold as a limited-edition release to raise money for the Pennsylvania bartending community as it coped with the COVID-19 pandemic, according to a news release. After the success of the limited drop, the guys started looking for ways to make a new version of the whiskey.

"After our higher-end releases, it was important for us to make a whiskey priced that all of our fans could try and that bartenders would want to use in everyday drinks," Day said in a statement.

Customers can also shop the new Four Walls merchandise shop, where proceeds of select items will benefit Tales of the Cocktail Foundation, a nonprofit that "works to educate, advance and support the global cocktail community."

The brand posted a 47-second video starring Day, Howerton and McElhenney to its YouTube page. The video, done in the style of an old-fashioned commercial, hilariously shows the supposed origin of the spirit.

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Is Rob McElhenney copying Ryan Reynolds?

The "Always Sunny" stars are just the latest celebrities to create their own alcohol.

George Clooney helped found Casamigos tequila, "Breaking Bad" co-stars Bryan Cranston and Aaron Paul have Dos Hombres mezcal, Woody Harrelson has Origen vodka and Harmony gin, and Jennifer Lopez has Delola ready-to-drink spritzes.

Superstar Ryan Reynolds, who owns the Wrexham football club with McElhenney, also has his own liquor: Aviation American gin.

McElhenney jokingly calls Reynolds an "alcohol baron" in the premiere episode of "Welcome to Wrexham," a docuseries about the actors buying the team and turning it into a success story.

"I have TV money but as I started to look at how expensive it was to actually run a club, I realized I needed something more than TV money," McElhenney says. "I needed movie star money. More than that, I needed superhero movie star money. More than that probably as we ascended up the leagues, I would need alcohol baron money ..."

Sales of Four Walls will determine whether McElhenney and the rest of the gang can add "alcohol baron" to their own résumés.

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