In case you haven’t OD’d on Jay-Z’s wife: Last night competing with Best in Show’s Westminster champions strutting plus Best in Show’s White House champ Obama speaking, Mrs. Carter’s own HBO documentary “Beyoncé: Life Is But a Dream” got screened for some high-class individuals at the Ziegfeld Theatre.

It’s billed as “In Her Own Words, a film by Beyoncé Knowles.” She made it herself, conceived the idea herself, talks about herself herself. Edited the footage herself.

She tells how she left her dad’s management to personally handle her own affairs. Tells of her relationship to Jay-Z. She says, unable to unfold innermost problems to anyone, she talks to her computer every night. Thus, it and she alone have all this feeling and private information locked up. Wherever, whenever she travels, the computer goes along. On helicopters, in cars, to hotel rooms.

The documentary, “a difficult process,” took three years. A co-director shadowed her. Added performing clips. Filmed in different places. Showed pieces from MTV, Grammys, “ET,” Billboard awards.

She confides “Game of Thrones” is her favorite TV show. Explains how a simple girl married one of music’s biggest. Of the pregnancy: “Like falling in love, you’re so open. Overjoyed. No words to express having a baby growing inside. You want to scream and tell everyone. But to be sure all’s safe, I had to hide this best thing in my life.” And, most delicious of all, she shows us baby Blue Ivy.

It premieres Saturday 9 p.m. on HBO.

EVERYBODY in this town’s busy. Liza, who hasn’t laid off since kindergarten, is like crabgrass. Everywhere. In 1972, she copped an Oscar for “Cabaret.” Now, its 40th anniversary, the movie’s out anew on Blu-ray. Says Miss Minnelli:

“The color’s more vibrant, the experience is heightened, glitches were fixed, stuff’s been added and, frankly, I don’t know what the hell Blu-ray is.

“I know I was 5-foot-5 then. From hip surgery I’m 5-foot-3 now. I remember going to Germany with Fred Ebb, who wrote this for me. I remember the jacket I wore over a purple dress. I remember everything about it.

“I’ve managed to preserve my old costumes. Like all those Halstons. I once saw an architect store his plans in very thin drawers. Since hanging jerseys or heavy beaded things stretch, I now store all my outfits in 3 1/2- by-2 1/2- inch wooden drawers.”

Also Monday she saw kid sister Lorna’s “Living Room” show debut at Birdland. Also her concert’s March 1 in London and March 5 in Paris. Also with Alan Cumming at Town Hall March 13 and 14. Also plays herself on April 14’s “Smash.” Also in Netflix’s new “Arrested Development” season.

Not bad considering she’s 2 inches shorter.

FORGET everybody, every thing is also busy. Ready? Cats are auditioning for a “Breakfast at Tiffany’s” play. Director Sean Mathias about his cat casting call:

“They’re rehearsed same as dogs. Food rewards. But cats onstage are not easily trainable. Cute, sleek, independent, this one’s role is pivotal. Act 2’s a party. The animal’s fondled by participants. Then thrown into a trash bag, so it must react properly. Our penultimate ending requires this feline actor or actress to perform theatrical business. Be touching.

“You can’t book a cat without the trainer along. Doing our London production, its trainer said it got sick. Actually, I think he was two-timing us, like he’d landed another better-paying gig, although that cat really got a fair whack and earned more than some actors. So we had to go on with his understudy.

“This one gets a curtain call. And gets mentioned in the Playbill.”

Any specific regulation as to color, size, type?

“In the original book it’s a calico named Ginger Tom but, no, to me a cat’s a cat. I just want a cat. So we’re holding a 5 p.m. casting call.”

Purrfect. Tabby & Company begin meowing at the Cort March 20.

AT a movie-screening event some cross-dresser drag queen fan went wild at seeing Nicole Kidman. Rushed up, showed her iPhone pictures of himself in full wig and looking, he thought, exactly like her. He said he impersonates her at events. Cool Nicole: “Next time try to do me as Satine in ‘Moulin Rouge.’ ” . . . Christina Aguilera: “I always wanted to work summers in a fast-food drive-through. Seems like a cool job.”

SPIKE Lee on the Oscars. “When my ‘Do the Right Thing’ lost to ‘Driving Miss Daisy’ I had a twinge. I said, ‘What can you do? I give up.’ And Martin Scorsese told me: ‘It’s America. Children of light get passed by children of darkness.’ The industry is dominated by 12-year-olds. I’m not snobbish but, c’mon . . . ‘American Pie’? Sticking your d – – k in a pie? That’s a movie?”

THE 007s are getting older. If ever they redo “Goldfinger,” that won’t belong to the villain — it’ll be from his urologist.

YESTERDAY, with 45-degree temperature and streets already clean and clear, an event planner’s excuse as to why no big names attended his evening: “The snow kept them away.”

Only in New York, kids, only in New York.