There was one final episode of ‘The Late Show’ Thursday night … but it was more like one final excuse to keep the party going late into the night, thanks to the massive after-party following the show’s last-ever episode!

Check out the gallery — Stephen Colbert was grinning ear-to-ear all night, celebrating with a stacked guest list including David Schwimmer, Gayle King, Ewan McGregor and Paul Rudd.

Keep scrollin’ through the gallery … because the celeb turnout at Beatrice in NYC didn’t stop there. Drew Barrymore, Paul McCartney, Padma Lakshmi and more rolled through — with someone online sharing Stephen even hitting the dance floor to show off a few moves of his own.

Safe to say everyone came out to celebrate their guy … which is more than can be said for Donald Trump, who basically waved goodbye with a grin — calling Stephen a “no-talent” in a scorched-earth Truth Social post Thursday.