Soon after the curtain came down on Thursday’s opening-night perf of the Broadway revival of “Cat on a Hot Tin Roof,” Benjamin Walker, Scarlett Johansson’s co-star, was handed a drink.

That prompted a question: Had he ever tried to do a run-through of the Tennessee Williams play — which involves an epic bout of onstage imbibing by Walker’s alcoholic character Brick — with real booze?

“It boils down to 10 finger-and-a-half drinks,” Walker said at the afterparty at the Lighthouse at Chelsea Piers. “I’ve done it before, but never in the course of three hours. And I’m sure I didn’t recover as well as Brick would.”

“Cat” reps something of a first for director Rob Ashford. He’s directed only musicals on Broadway, but in the U.K. he’s helmed two very high-profile plays: “A Streetcar Named Desire” starring Rachel Weisz and “Anna Christie” with Jude Law.

Since “Cat” is Ashford’s first play gig in Gotham, it’s something of a coming out party for him. “I feel like one of those husband with two families,” he quipped.

Ashford next returns to song-and-dance, choreographing the Oscars. But then it’s back to the world of straight plays, co-directing “Macbeth” with Kenneth Branagh as part of the Manchester Intl. Festival.