NYC- Some prominent johns of New York’s priciest escort should be shaking in their wingtips after an artist vowed yesterday to put a painting of the sex-kitten and her “clients” on an Internet auction block.

Artist Hulbert Waldroup said he’s selling the painting and others to raise money for Natalie McLennan’s defense fund and for a battered women’s shelter.

McLennan, accused of being a high-priced hooker who charged $2,000 an hour, is depicted in the nude in some of the life-size works.

But the pop painter’s decision to also expose some of the faces in McLennan’s little black book is causing conundrums from Wall Street to the NFL.

“You’ll be able to recognize them,” Waldroup, 37, said yesterday, refusing to name names on the advice of his attorney.

McLennan, a leggy auburn-haired beauty known in the underworld sex trade as “Natalia,” has publicly bragged her clients ranged from a hedge-fund heavy and a software king to a professional quarterback.

Waldroup said he’ll auction off the six paintings on eBay starting this morning, with the works of McLennan in the nude fetching first bids. He refused to show the painting of the johns, explaining that he’s waiting until midnight Monday to unveil the piece on the eBay auction site.

Waldroup is accused of answering the phones and booking escort gigs at the busted NY Confidential brothel at 79 Worth St. in Tribeca.

He also plans to auction another painting that includes several prominent attorneys he claims offered legal advice to NY Confidential founder Jason Itzler. The heads of the lawyers are painted on the bodies of animals.

In January, Waldroup was indicted on charges of promoting prostitution along with McLennan and Itzler, 37, the self-professed King of All Pimps.

All the defendants appeared at a hearing yesterday in Manhattan Supreme Court.

McLennan didn’t comment on Waldroup’s paintings. But the one-time Canadian tap-dance champ did say her life has dramatically changed from the “fairy tale times on Worth St.”

“It’s more like something from the Grimm brothers,” she quipped, referring to the dark fairy tales of the Brothers Grimm.

It’s not the first time Waldroup’s artwork has sparked controversy. He raised the ire of police in 2001 by spray-painting a 20-by-35-foot mural in the Bronx titled “The American Dream” that depicted the four cops who shot unarmed African immigrant Amadou Diallo as hooded Ku Klux Klan members.