All these knights in shining armor couldn't save a maiden in undress from a female security guard.

Kathleen Neill, 26, was busted yesterday among the other classic nudes at the Metropolitan Museum of Art for posing naked. Cops charged her with public lewdness.

She's the latest project of photographer Zach Hyman, who makes a habit of shooting nude models in public places.

"Everything was going perfect until the very end," said Hyman. "Then it became a worst-case scenario."

But not exactly unexpected — since he acknowledges having his lawyer on speed dial and bail money handy whenever he does a shoot.

This was the first time any of his models got arrested.

The guard in the Arms and Armor gallery explained, "I had to make sure that girl was turned over to the police. There were little kids in here watching the whole thing."

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