VIDEO : Hailey Baldwin Reveals Justin Bieber's True Feelings About Kendall Jenner

Looks like Hailey isn?t such a good liar when answering questions about her fiancé, Justin Bieber!

In a teaser from "Carpool Karaoke," Hailey Baldwin and Kendall Jenner get hooked up to a lie detector.

When Kendall asks if Justin thinks she's cool, Hailey says "Of course," but is called out on her lie.

According to Access, the two models burst into laughter and Jenner playfully hits Baldwin.