Kim Kardashian hopes that her stint on "Dancing With the Stars" will help her firm up her famous booty.

"I really want to be toned. Every girl has her insecurities, whether she is skinny or not. You want to look good when you’re on vacation in a swimsuit," the pin-up reality star told OK! magazine.

But she doesn't want to lose her curves.

"I don’t even think that’s really possible. I’m going to probably have kids soon, so I want to have the perfect body before then. It’ll be harder to get in shape afterward, so why not do it now," she told OK!

"I know that I'm not a stick-skinny girl, and I don't want to be or try to be," she adds.

Meanwhile, she's already lost a few pounds on the show.

"Nothing too crazy yet, but I heard that you really start to lose weight when the show starts," Kardashian tells OK!

But Kim says she "looks a lot bigger on TV."

"When I meet people, the first thing they say is, 'Wow, you're so much smaller than I thought.' I look about 15 pounds heavier. I'm only 115 pounds, and everyone thinks I'm like 130 or 140. It's bizarre. I'm a size 2!"

Kardashian's fans recently accused her of lying when she claimed to have a 26-inch waist.

“I am a size 27 jeans,” Kim wrote in her blog last Friday. “My measurements are 34, 26, 39. But remember I am 5’2” and ½ and everyone carries their weight in different places.”

When fans begged to differ, Kardashian fired back:

"I am really sick and tired of people being so mean and nasty and assume I am lying,” she wrote, adding, “JUST FOR YOU NON-BELIEVERS, I WILL POST A VIDEO BLOG OF ME SHOWING YOU GUYS MY SIZE 27 JEANS LATER TONIGHT!”

The “Keeping Up With the Kardashians” star then filmed the tags from three pairs of her favorite jeans and put on each pair for the camera.

Click here for more from OK! magazine

Click here for Kim's blog