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Kendall Jenner

FYI

Are you sitting down for this one, Kim Kardashian?

We knew Kocktails with Khloe was going to be full of surprises. We just weren't expecting Kendall Jenner to deliver one heck of a bombshell.

In a sneak peek at tonight's star-studded premiere, the supermodel picks up the phone to call her older sister with a huge confession.

"I was calling you because I wanted to tell you something and I haven't told anyone yet because I feel like you could help me figure out what I should do," Kendall explained. "I am pregnant."

"Are you kidding?" Kim asked. "Were you calling looking for mom?"

PHOTOS: Khloe Kardashian's hottest gym pics

Not exactly! Kendall was actually delivering the ultimate prank on the proud mother of two.

"No, I didn't know who to tell first," Kendall shared. "I felt that if I told mom, she would freak out so I'm coming to you for your support first." So thoughtful, right?  

Instead of shedding tears of joy, delivering disappointment or simply expressing happiness, Kim decided to turn the conversation into how she is doing with two kids.

"I don't know. I'm not the one to talk to. I've had the worst experience and I'm so fresh off of the worst birthing experience," Kanye West's wife explained. "I mean, today is not the day because I'd literally be a little more negative because I'm on like one hour of sleep because North was up all night and I was feeding her every two seconds and literally my day has been so crazy and I had no sleep and I want to die but oh my god it's so hard."

Khloe Kardashian

Richard Shotwell/Invision/AP

To prolong the prank even further, Kendall began to make crying sounds to showcase how upset she was at the news. Did it make Kim have a little bit more sympathy? Not exactly.

"Do you want me to come over?" she asked. "I can bring like my 30 kids and you can babysit for like two seconds and see how you feel." Ultimately, Khloe Kardashianalong with her guests Aisha Tyler, Kym Whitley and Brandi Glanville share that it's all for show. Kendall is not expecting, dolls! 

Kocktails With Khloe premieres tonight at 10 p.m. only on FYI.

New episodes of Keeping Up With the Kardashians air Sunday nights at 9 p.m. only on E!