AceShowbiz -

Kendall Jenner pranked her elder sister Kim Kardashian in the January 20 episode of "Kocktails with Khloe" by telling her that she's pregnant. Instead of freaking out or expressing happiness about the news, the 35-year-old reality star complained about her tiring day after taking care of her two children.

"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 her elder sister on the phone. "I am pregnant."

"Are you kidding? Were you calling looking for mom?" Kim asked calmly. Kendall replied, "No, I was looking for you because I didn't know who to tell first. I felt that if I told mom, she would freak out so I was like coming to you for your support first."

Surprisingly, Kim turned the subject of the conversation to her tiring day with two kids. "I mean I don't even know. I'm not the one to talk to because I've had the worst experience and I'm so fresh off of the worst birthing experience," she 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."

"Literally, my day has been like so crazy and I had no sleep and I want to die but today I feel like, 'Oh my god it's so hard,' " Kim added. To prolong the prank, Kendall began to make crying voice to show how sad she was about her pregnancy. Hearing Kendall crying, Kim became sympathetic and asked, "Do you want me to come over? I can bring like my 30 kids and you can babysit for like two seconds and see how you feel."

Khloe Kardashian who hosted the show then took over the phone and told Kim that it was just a prank. Both Khloe and Kendall said that they're surprised by Kim's response to the news as they thought she would freak out. The Victoria's Secret Angel said, "[Kim]'s like, 'O.K., go for it.' "