Kim Kardashian is back in leather.

The new mom showed off her post-baby bod during a new photo shoot with sisters Kendall Jenner, Kylie Jenner and Khloe Kardashian on Monday -- where she was seen wearing a sheer black top, sexy bra and black leather skirt.

She also appears to be wearing her "Nori" necklace.

No word what the shoot was for, but with her blonde hair and fresh makeup, Kim looked amazing. 

As for her sisters, they all looked flawless too -- though 16-year-old Kylie's dress (right) is a little risque for her age, don't you think? 

Kendall, 18, showed some skin too in a vintage Alexander McQueen gown.

What do you think of their looks? Sound off below. 

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