I think its from a show she did a few years ago called "Hot Sluts" (yes that is the actual name). Kind of hard to find though since searching pretty much just turns up porn. But you can check IMDB.
Once again, like so many times before the last couple of months, Kourtney Kardashian........
And I am sure it wont be the last, just looking at this pic now, I feel like paying tribute to her beauty again.....