Broadway star Ariana DeBose brought the razzle-dazzle to the Townhouse this weekend, surprising patrons at the upscale gay piano bar with some spontaneous showstoppers.

A spy tells us the “Hamilton” star — who won an Academy Award for her role in Steven Spielberg’s “West Side Story” — got on the mich to perform “Suddenly, Seymour” from “Little Shop of Horrors” and “Don’t Cry For Me Argentina” from “Evita” in front of an adoring crowd.

A source tells us the chanteuse was at the spot for New York Magazine Editor-at-Large Erik Maza’s birthday.

“It’s not everyday an Oscar winner stops by the Townhouse,” said a spy.

The piano joint, which the New York Times once described as drawing “dapper gentlemen and their younger male admirers,” has long been a magnet for scene-stealing female stars.

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