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Kris Humphries may not be a soon-to-be daddy afterall ... at least according to this photo that his ex Myla Sinanaj Tweeted out.

Sinanaj, 25, posted the above photo of a noticeably flatter tummy along with the following, "Uhhh ooooo Loook No baby bump!"

Kris' ex, who snapped the photo while hanging with friends at Mountain Creek Water Park, added, "Shocker‬ yes I'm a thick curvy girl All natural I'm comfortable in my skin."

So is she ... or isn't she? We have a feeling Kim Kardashian's ex DEFINITELY wants to know!