Rob Kardashian I'm Gettin' Slimmer by the Second

3/12/2016 7:21 AM PST BY TMZ STAFF
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0312-rob-kardashian-snapchat-02Rob Kardashian has made huge strides in the body dept., looking about half his former self.

Blac Chyna posted the pic Friday night showing shades of the old Rob.  

It seems Rob's happy with the results ... he's checking himself out in a mirror.  The pic was taken at the Diamond Supply Company ... an L.A. clothing store.