Get ready for some serious shakeups in the Kardashian household! After a few days of feeling nauseous (and a couple of missed periods), Khloe convinces Kourtney to take a pregnancy test. But when the test comes back "sort of" positive, Kourtney knows she needs to break the news to her boyfriend, Scott. But are they ready to own up to the responsibility of being a parent? Or will this end up being just one big pregnancy scare? Also, Kourtney joins the rest of the Kardashian girls for a weekend in Sin City, but when Scott ends up popping the question after a night of drinking, will they end up at the altar in a shotgun wedding? You'll have to see it to believe it!