Before hitting the road, the two stunners lobbed a series of questions to each other, as a man in the backseat revealed whether they were telling the truth or not.
The Qs included things like, "Do you like my hair like this?" and "Have you ever created a fake Instagram to look at what an ex boyfriend is doing?", before Kendall asked her friend, "Does Justin think I'm cool?"
Baldwin, who showed off her huge engagement ring throughout the video, told her, "Of course" ... but the man in the back said otherwise.
The rest of the preview for the new season included highlights of other episodes, including sneak peeks at The Muppets driving around with Jason Sudeikis, Matthew McConaughey and Snoop Dogg and Jamie Foxx with his daughter, Corinne, before ending with Kendall and Hailey rocking out to Panic! at the Disco's "I Write Sins Not Tragedies."