Kim, 33, stripped down to a crop top earlier today (13 May) before taking a selfie in the mirror. Is that the outline of a six-pack we see?!
Last May, Kim gave birth to her first child - daughter North West - and has been on a constant quest to lose the extra baby pounds ever since.
In total, Kim put on three-and-a-half stone while pregnant with North but it appears she has managed to work off every single last ounce!
Sharing the selfie with fans on Instagram, Kim told them: "Just finished my morning workout."
Back in October, Kim appeared on US chat show Jay Leno and admitted that losing her baby weight had been the "biggest challenge" of her life.
Having already shed three stone by that point, Kim said: "I had pre-eclampsia, so I would swell up. It's really dangerous actually so I had to deliver five weeks early. At the time I didn't know what was going on."
She added: "It was honestly the greatest challenge of my life to have gained 50lbs. Actually, I got on the scales today and it said that I am 50lbs down, and that made me really excited."
In March, Kim revealed that she had lost weight with help of the Atkins Diet and five weekly workouts.
Chatting with fans via Mobio INsider, she said: "I did the Atkins Diet. I actually saw I gained some weight back when I saw pics of myself and started it again. Had to check myself.
"I work out five times a week and try to eat as healthy as possible."
It's certainly paid off, Kim!
Celebrities who have welcomed babies in 2014:
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