Kendall Jenner is up to no good in a brand new sneak peak of Khloé Kardashian's new talk show "Kocktails With Khloé." In the video, Kendall prank calls her older sister Kim Kardashian and tells her that she is pregnant.

"Hey. Um, so 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 told Kim.

Kendall then revealed her fake secret to her sister, who sounded shocked on the other end of the phone.

"I'm not the one to talk to because I have, like, the worst experience and I'm so fresh off of, like, the worst birthing experience," said the mother to Saint and North West. "I mean, today is not the day cause I literally would be a bit more negative cause I'm on one hour of sleep cause North was up all night and I was feeding [Saint] every two seconds and literally, my day has been like, so crazy and I've had no sleep and I want to like, die. Today is - I feel like, oh my God, it's so hard."

The other guests in the room, including Aisha Tyler, Kym Whitley and Brandi Glanville, could not contain their laughter as Kim took the situation totally seriously.

Khloé could not take it anymore and rolled her eyes at the conversation between her sisters and interrupted.

"Kim! It's Khloé. Did you know that we were calling you? You're on my show," Khloé told Kim. "That was a Debbie Downer! I felt like that was the most like, yawn, I was like, 'Oh my God!'"

"Kocktails with Khloé" premieres Wednesday at 10 p.m. ET on FYI.

Check out the sneak peak below: