Credit: AP Photo/Tammie Arroyo

So long, size 00.

Pin-thin stylist Rachel Zoe is pregnant, the new Us Weekly reports.

“It’s very hush-hush,” a source says of the fashion maven, 39, who is ­expecting her first child with husband of 12 years Rodger Berman. “She’s telling people she can’t travel,” notes the insider.

And a witness says that at the Veuve Clicquot Polo Classic event in L.A.’s Pacific Palisades area on Oct. 10, Zoe only imbibed water with lemon, while Berman sipped champagne.

The news even brought out well-wishes from her former costar, Brad Goreski, though it’s been reported they’re feuding.

“We’re still close,” he tells Us, without confirming the pregnancy. “I hope to be in the delivery room!”