When Khloe Kardashian walked the red carpet at Thursday's NBC Universal Upfronts in New York City, it was hard to miss her voluptuous backside.

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Following her stunning appearance, the 29-year-old was accused of having fake curves. And, while Kardashian may stay mum about certain rumors, she quickly let everyone know that her behind is simply the result of strong genes and a consistent workout.

"Sorry 2disappoint.... I've always had an a--. I know its more fun 2believe its not real, kind of a compliment since I kill myself in the gym," she tweeted.

"Look back at it kids.... Lol," she added. "Get it right! Get it tight!"

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Yet, such rumors are common for the Kardashian sisters. Older sis, Kim Kardashian, is often accused of plastic surgery rumors, especially when it comes to her famous butt. The star was even accused of using unnatural methods to shed her baby weight after giving birth to North West last June.

At the time, one fan tweeted the 33-year-old and said, "Why is it so hard to believe she works out hard for her body? Let her be skinny in peace! You look great."

Kardashian responded, "Preach! LOL thank you. It sucks when people make up surgery or photoshop lies when I am so disciplined & work so hard! Just trying to motivate others & show anyone struggling with weight they can totally achieve whatever they want if they are dedicated!"

Tags: Khloe Kardashian Kim Kardashian