Kendall Jenner pranks her family by telling them she's engaged during a ...

Kendall Jenner left her family speechless when she pretended that she had gotten engaged during a game of Truth or Dare with sister Kourtney Kardashian.

The 25-year-old model was talked into the prank by her older sister as part of a Truth or Dare game featured in a for the 42-year-old Keeping Up With The Kardashian star's Poosh lifestyle website.

The joke was perfectly calibrated to show everyone, as Kendall admitted it was 'believable' that she would get engaged. 

Fooled ya! Kendall Jenner, 25, pranked her family by claiming she was engaged in a Truth or Dare drinking game video she filmed with her sister Kourtney Kardashian, 42, for her Poosh channel on Saturday

Fooled ya! Kendall Jenner, 25, pranked her family by claiming she was engaged in a Truth or Dare drinking game video she filmed with her sister Kourtney Kardashian, 42, for her Poosh channel on Saturday

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Kourtney opened the video, which was for her Poosh Your Wellness festival, with a trip to the bar, where she and Kendall both poured modest glasses of Kendall's recently unveiled tequila label 818.

The catwalk star highlighted her slender figure in a cropped tank top covered in hypnotizing black-and-white tiger designs, while Kourtney wore a white tank top and white pants with cut-out slits over her thighs. 

After settling the drink situation, they sat down on the sofa for a game of Truth or Dare. They were each allowed to skip up to three times, though they'd have to drink each time.

Kendall seemed to get the biggest dares, including a request to tell everyone in her family's group chat that she was engaged.

To add to the illusion, one of their assistants temporarily donated her own large engagement ring, though it was too big on Kendall's finger. 

Loosening up: The Keeping Up With The Kardashians stars opened the video by pouring modest glasses of Kendall's new 818 tequila

Loosening up: The Keeping Up With The Kardashians stars opened the video by pouring modest glasses of Kendall's new 818 tequila

Smooth sailing: They did easy ones to start, with both admitting their favorite weird food combinations. Kourtney also had to jump rope 90 times

Smooth sailing: They did easy ones to start, with both admitting their favorite weird food combinations. Kourtney also had to jump rope 90 times

Although she was hesitant about doing it, especially after Kourtney only had to admit her weirdest food combinations and jump rope 90 times, but she followed through and sent a photo of her ring finger with the new bling.

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'But it's believable, so I will do it,' she said, though she felt embarrassed to be borrowing the engagement ring.

'This is amazing, I just can't wait to see,' said a smiling Kourtney. 'You know Khloé's going to write a novel.'

Kylie was the first one to call her after seeing the photo.

'You're lying,' she said without a pause.

They didn't bother keeping up the ruse with her but told Kylie to 'play into it' in the group chat. 

Game for anything: Then Kendall had to text her family's group chat that she was engaged. 'But it's believable, so I will do it,' she said, though she felt embarrassed to borrow an assistant's engagement ring for a photo

Game for anything: Then Kendall had to text her family's group chat that she was engaged. 'But it's believable, so I will do it,' she said, though she felt embarrassed to borrow an assistant's engagement ring for a photo

Not fooled: Kylie was the first one to call her after seeing the photo. 'You're lying,' she said without a pause, though they asked her to play along

Not fooled: Kylie was the first one to call her after seeing the photo. 'You're lying,' she said without a pause, though they asked her to play along

Kylie got cut off because Kendall had to take an incoming call from Kim, though the Skims founder's first words were unintelligible.

Kourtney didn't waste any time and asked her to keep the deception going as well.

'Kendall, wait what?' read a text from Khloé, who called her immediately while with some friends.  

'That's so stupid. Why would you do that to us?' she said after they spilled the beans, though Kendall said it was 'so fun.'

'Well at least we know you guys will be excited when the day comes,' Kourtney added.

Not a fan: Kim was fooled, and Khloé had to call because she was so shocked. 'That's so stupid. Why would you do that to us?' she said after they revealed the ruse

Not a fan: Kim was fooled, and Khloé had to call because she was so shocked. 'That's so stupid. Why would you do that to us?' she said after they revealed the ruse

Loved up: Kendall may have been able to fool some of her sisters because her relationship with Phoenix Suns Shooting Guard Devin Booker has been going so well; seen on April 24 in NYC

Loved up: Kendall may have been able to fool some of her sisters because her relationship with

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