Post Malone & Jimmy Fallon Lead Fantastic Drunk Irish Sing-A-Long

Post Malone and Jimmy Fallondon't care that it's almost Halloween, they were in the mood to celebrate St. Patrick's Day.

The two stars hit up Paddy Reilly's Music Bar Monday night in NYC, and ended up leading a Celtic chorus of some of the most popular Irish drinking songs.

We're told the rapper and the late-night host were downing Irish car bombs before grabbing a pint and belting out a round of "No, Nay, Never." Fallon had to whip out his phone for some of the lyrics, and he and Posty had the entire bar stomping along to the music.

Gonna be a rough top o' the morn.

TheBlast.com