The Piano Man’s celebration of his 100th gig at Madison Square Garden was a scene from a Greek restaurant.
Billy Joel was seen a few blocks south of the “World’s Most Famous Arena” at Kyma Flatiron on Wednesday night with a group of 20 people around 11:15 p.m.
“He posed for some photos outside the restaurant with fans and was in great spirits,” a source told Page Six on Thursday.
The 69-year-old “Movin’ Out” crooner’s party was served family-style dishes of langoustines, octopus, sesame feta, whole fish and the eatery’s signature Kyma chips. The restaurant’s staff also surprised him with a dessert complete with sparklers.
“Everyone was happy and clapping,” we’re told.
As for his milestone performance, he performed his classic songs “New York State of Mind” and “We Didn’t Start the Fire.” Fellow music legend Bruce Springsteen also joined him on stage at one point.
“When I’m onstage, sometimes I have this moment where I’m taking all this in and going, ‘This is nuts,'” Joel told The Post in an interview published the day of this centennial show. “Don’t they know who I really am? I’m just a little kid from Hicksville who became a musician and it turned into this crazy thing.'”