Kim Kardashian only weighs around 120lbs at nearly 5ft3in.But on Monday the 39-year-old siren revealed on her Instagram Story that she is actually a size medium in her SKIMS apparel which ranges from size XXS to 4X.The mother-of-four was modeling the velour bandeau top, hoodie and sweatpants from her new collection which goes on sale on Wednesday, which is her 40th birthday.
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