Kris Humphries Dishing Dirt on Kim Kardashian's Ass-ets 1Kim Kardashian will reportedly paint ex Kris Humphries as the heavy for the sudden collapse of their marriage on her TV show, but Kris isn’t waiting for her to fire the first shot. He’s dishing his own dirt.

Kris, who knows Kim as intimately as anyone, is taking shots at her most famous asset, namely, her ass.

“Kris told his buddies that it takes a lot of work for Kim to make her bottom look as good as it does,” a source told The National Enquirer.

“He revealed all her secrets: how she uses ‘booty pads,’ Spanx and other things to enhance it. When she takes off the Spanx, the pads and everything else, it’s not the same,” the source claimed.

The curvy 5’2″ Kim vehemently denies undergoing any plastic surgery, but who can believe her now?

She allegedly got a Brazilian butt-lift to make her money-maker look rounder and firmer, say insiders.

“He knows what the real thing looks like – because he’s recorded it on his cell phone camera!” says an insider.

“Despite what Kim said on her show, I think she has definitely had fat injections in her butt. Kim would never call it a Brazilian butt-lift, but that’s essentially what it was.”

Humphries, 26, a pro basketball player who has an athletic body, reportedly mocked Kardashian, 31, for being chubby.

Kim tells everyone she weighs 115 pounds, but Kris told pals she’s closer to 130 lbs.

“Kris would pat Kim’s bottom and say, ‘You sure have a lot of junk in your trunk,’ ” says the source.

“Then Kris actually began calling Kim fat! He said the undersides of her arms were flabby and she was getting a pooch in her belly. Kim was furious!”

Kardashian made headlines when she filed for divorce after being married for just 72 days. The move touched off a media storm that slammed Kim and cracked her teflon-coated image, amid charges the marriage was a sham.

Now Kim is reportedly gearing up to use her reality show “Kourtney & Kim Take New York” to demonize Kris in a bid to resurrect her own image.

Kris may be sending a not-so-subtle message that two can play that game.