11/05/2013 AT 10:00 AM ET
Kim Kardashian has a clear dress code for work: sleek and sexy.
The newly engaged reality star, who made waves with a revealing swimsuit selfie last month, is once again flaunting her trim post-baby body, posting a photo on Instagram Monday that showed her busy at a photo shoot.
And what a day at the office it was: In the pic, which she captioned “Work day,” Kanye West’s fiancée wears a sheer, midriff-baring ensemble that highlights her ample curves while drawing attention to her trim waist.
Kim has been working hard at her new figure: The new mom, who recently told PEOPLE that her pregnancy was “a lot tougher than people saw on my show or from magazines,” has been on a strict Atkins-based diet and workout regimen. It’s clearly working: So far, she’s already shed 50 pounds of baby weight.
But she wasn’t the only Kardashian perking up Instagram on Monday.
“If only I could give you this sunset,” “Khloé wrote in the caption.