Hailey Bieber Just Made A Shocking Revelation About Kendall Jenner

Instagram | Hailey Bieber

Hailey Bieber, 24, and Kendall Jenner, 25, appeared on an episode of "Carpool Karaoke," a recurring segment of "The Late Late Show with James Corden," in 2018, and during their appearance, the models asked one another a number of juicy questions as a man sat in the backseat of their vehicle with a lie detector test.

"Have you ever snooped on a boyfriend's phone?" Jenner asked, via YouTube.

"Yes, I have," Bieber admitted as the lie detector operator confirmed her answer was true.

Instagram | Kendall Jenner

"Have you ever snooped on my phone?" Jenner wondered.

"Yes, I have," Bieber replied, again offering a "true" response to her longtime best friend's question. 

As the episode, which also featured single Miley Cyrus, continued, Jenner wanted to know if Bieber had ever shared a photo of the two of them together in which she wasn't looking like her best self. 

"Have you ever posted a photo of us where I look bad but you look good?" she asked.

"No, I haven't," Bieber responded.

Instagram | Hailey Bieber

Although Bieber's first answers were all deemed as "true" by the lie detector operator, she got caught lying when Jenner asked her if she liked the silver turtleneck dress she was wearing at the time,

"Do you like my outfit?" Jenner questioned her friend.

"I do like your outfit," Bieber offered.

But quickly, the operator determined her answer to be false. 

Scroll on to find out how Bieber attempted to make things right with the "Keeping Up With the Kardashians" cast member after being caught in the lie.

Instagram | Hailey Bieber

"I do!" Bieber insisted as Jenner laughed hysterically.

Although Bieber may not have liked what she was wearing, Jenner didn't take the comment personally and made it clear that she was amused by the accidental diss.

Later in the episode, before Cyrus joined them in their car, Bieber turned the tables on Jenner as she proceeded to ask her a number of questions about her own behavior.

"Have you ever posted a photo where I look bad but you look good?" Bieber asked.

Scroll on to find out what Jenner said.

Instagram | Hailey Bieber

"Probably," Jenner admitted.

In one particularly awkward moment on the show, Jenner wanted to know how Bieber's husband, Justin Bieber, felt about her. So, she asked Bieber, "Does Justin think I'm cool?"

"Of course," Bieber replied.

But apparently, Justin doesn't think she's cool.

"That's a lie," the lie detector operator said from the backseat. 

Still, Bieber insisted she was telling the truth.

"I promise you he does!" she assured Jenner.

Scroll down to the article below to find out what Bieber recently decided to quit Twitter, and how she handles social media today.