Kourtney Kardashian will skip the Photoshop, thank you very much.

The latest issue of OK! magazine claims it has an exclusive with Kourtney Kardashian, including her "Diet Secrets" and how she lost "10 lbs in 10 Days," but it sounds like the exclusive is news to Kardashian.

Along with quoting the reality star, her friends and her stepfather, Bruce Jenner, the magazine shows Kardashian in super svelte (impossible?) form just one month after giving birth to a baby boy, Mason Dash.

Now the "Keeping Up With the Kardashians" reality star is fighting back. Kourtney denies she ever spoke to OK! for the article and tells WWD, "They doctored and Photoshopped my body to make it look like I have already lost all the weight, which I have not."

Kourtney also helped spread the word by updating her Twitter followers: "One of those weeklies got it wrong again... they didn't have an exclusive with me. And I gained 40 pounds while pregs, not 26... But thanks!"

Yikes, could this tabloid snafu spark a bit of sibling rivalry? Kim Kardashian has been the contributing beauty editor at OK! since last September.

We contacted the magazine for its side of the story, but a spokesperson for the publication declined comment.

Meanwhile, we will get a more realistic glimpse of Kourtney's "Body After Baby" when she and her sisters hit New York Fashion Week.