Kim Kardashian shows off trim physique on set on Nov. 4, 2013. Credit: courtesy of Kim Kardashian

What pregnancy? Kim Kardashian has no problem showing up her stunning new physique after giving birth to daughter North West just four months ago. The reality star, who was criticized for weight gain throughout her pregnancy, has been flaunting her trim figure all over social media. 

In mid-October she posted a sultry swimsuit selfie that showed off plenty of flesh, and in a new Instagram post on Nov. 4, she continues to display the results of her dieting and workout regimen. Kardashian, 33, shared a photo of herself on a set with the caption, "Work day." 

In the image, the new mom is wearing a black bra, covered by a sheer, long sleeve top that cuts off her her midriff, exposing her toned tummy. Kardashian's blond tresses frame her face beautifully. 

The look is reminiscent of a similar cleavage-baring black ensemble she sported at this year's Givenchy show in Paris Fashion Week, which she attended with now-fiance Kanye West in late September. 

Kardashian continues to shed the pounds thanks to the Atkins Diet and has already lost 50 since giving birth to little Nori. She recently admitted on The Tonight Show With Jay Leno that the "fat-shaming" she endured during her highly-publicized pregnancy, has changed how she handles herself. 

"It changed how I am in public," Kardashian said. "I've tried to live more of a private life."