Kourtney Kardashian Feeling Gray ... Thanks a Lot, Scott!

7/15/2015 12:49 PM PDT

Kourtney Kardashian -- Feeling Gray … Thanks a Lot, Scott! (PHOTO)

The latest victim of Scott Disick's antics is ... Kourtney Kardashian's long, flowing, formerly dark hair -- which has suddenly got a serious silver streak.

Kourt did lunch with Kim and Khloe, and flashed a patch of premature (she's only 36) grays around her right ear. 

The gray wasn't there just a week ago when she did the single parent thing at Disneyland.

Look, being a single mom, juggling 4 kids -- including Scott -- this was bound to happen sooner than later.

Silver lining: Hair matched her shoes!