Signature Theatre artistic director Eric Schaeffer with Patti LuPone at the Italian embassy on Monday. (Russell Hirshon)

A first for the Signature Theatre’s Stephen Sondheim Award gala: Instead of just basking in tributes, the honoree took the stage. “I shouldn’t be singing for my supper,” Patti LuPone told guests at the Italian Embassy Monday. “However, I had a little too much to drink; the wine’s been flowing. I’m not as young as I used to be, so the voice. . . we’ll see what happens. What the hell.”

The two-time Tony Award-winner, 62, was persuaded to sing by Signature’s Artistic Director Eric Schaeffer and gala chair Adrienne Arsht — and, of course, blew it out of the park with Sondheim’s classic “Anyone Can Whistle” and Kurt Weill’s “September Song.” Standing ovation? You need to ask?