The 33-year-old star, who gave birth five months ago to daughter North West, says she is annoyed at reports she lost 50lbs by having fat-reducing treatments.
The brunette beauty took to Twitter to address the reports and wrote: "I am very frustrated today seeing reports that I got surgery to lose my baby weight! This is FALSE.
"I worked so hard to train myself to eat right & healthy, I work out so hard & this was such a challenge for me but I did it!!!
"I'm so proud of my accomplishment & NO ONE will take this away from me with fake reports!"
Kim added: "Say what u want about me but I work hard & am the most disciplined person u will ever meet!"
According to Life and Style magazine, the star allegedly spent more than $80,000 on stretch-mark treatments and fat-reducing ultrasound procedures to get back in shape. But Kim claims the rumours are false and she did not take the easy way out.
The future Mrs Kanye West first showed off her post-baby body on 'Tonight with Jay Leno' and credited her success to the Atkins diet and regular workouts, while admitting harsh comments about her weight "really did affect" her.
She said: "It really hurt my soul. There were these stories where I was, like, 200 pounds. I was gaining weight because I was pregnant and it was really hard to read all these stories and hear all these nasty things."