"I need to see your butt," Kimberly Smedley told a Post reporter posing as a customer last week in a suite at the Eastgate Tower Hotel on East 39th Street.

Smedley, a heavyset woman wearing camouflage pants and fake Ugg boots, then demanded $1,600 in cash to give nine injections to each cheek...

When it was her turn, [one] woman lay face down on a couch, in view of the others, while Smedley gave her about 10 shots on each side.

"I wanted a J.Lo butt - full, round and high," the woman said.

The injections gave her the "lift" she wanted - at first. But now she is seeing doctors for many hard lumps, ripples and skin discolorations that have developed on her rear.

BEWARE.