Kourtney Kardashian Shares RARE Photo of Son Mason Disick

Mason Disick knows what it takes to dress like a Kardashian.

Case in point? When aunt Khloe Kardashian highlighted some of the family's fashion March 6, Kourtney Kardashian and ex Scott Disick's 14-year-old son stole the show in his all-denim ensemble.

In the Instagram Story, Mason donned a pair of baggy oversized jean shorts, a buttoned-up jean shirt and Timberland boots. He finished his look with a chrome chain, a black belt with an ornate silver buckle, statement rings and a Rolex watch.

As Khloe simply captioned the Story, "Go offfff Mase."

And the 39-year-old couldn't help but gush over his sleek accessories, exclaiming…