Kim Kardashian says people are always surprised by how skinny she is. The brunette beauty - who is currently competing on U.S. TV talent show "Dancing With the Stars" - insists her famously large behind makes fans think she is curvy all over.

She said: "I look 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 lbs heavier. I'm only 115 lbs, and everyone thinks I'm like 130 or 140. It's bizarre. I'm a U.S. size 2!"

Kim - who is dating American football player Reggie Bush - also said she hopes appearing on the show will help her tone up.

She added: "I'm going to probably have kids soon, so I want to have the perfect body before then."

"I've lost a few pounds - nothing too crazy yet, but I heard you really start to lose weight when the show starts."

However, the 27-year-old beauty admits she is not expecting to lose a drastic amount of weight, because she could never entirely curb her junk food cravings.

She said: "I know that I'm not a stick-skinny girl, and I don't want to be or try to be. And I love to eat. Cooking is a big part of my life. "When you're putting that much time into perfecting something, you don't want to just eat a cheeseburger. I've been eating better."

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