This town is big enough for the two of them, it turns out.

Page Six hears that in a rare confluence, thermonuclear exes Brad Pitt and Angelina Jolie are both in New York right now.

But we’re told that they’re having very different Big Apple experiences.

While Pitt is dining out with A-listers and supermodels, Page Six spies spotted Jolie shopping for groceries alone on the Upper West Side — or at least, the help spotted her.

“My nanny and daughter saw her at the Fairway,” said one well-to-do mom of Jolie.

(They even outsource their celebrity spying.)

It seems likely that the actress was picking up a few things for her kids, at least one of whom is apparently living in her old place in the famed Ansonia building in the tony neighborhood.

Jolie — who’s owned the place since 1997 and lived there during her own wild youth — told the New York Times in March that one of her sons is now in residence, and that her other children use it as “a crash pad.”

Meanwhile, insiders tell us that Pitt has been staying at the paparazzi-friendly Whitby Hotel in Midtown while promoting his new race car movie “F1.” [See Page 19 for more on the film.]

On Friday, Pitt and girlfriend Ines de Ramon stepped out for an A-list double date with Bradley Cooper and Gigi Hadid at Cote Korean Steakhouse.

“Real Housewives of New York City” star Jessel Taank told Page Six Radio’s Ian Mohr, Evan Real and Danny Murphy yesterday that when the famous pals got up to leave after they finished their dinner, the “Seven” star got a standing ovation.

While Pitt mostly lives in Los Angeles, Jolie has been in and out of New York.

She has her new cultural center, Atelier Jolie, on Great Jones Street, and she and daughter Vivienne Jolie-Pitt were producers on the Broadway show “The Outsiders.”

Reps didn’t get back to us.