Kendall Jenner Prank Calls Her Family While Playing With Kourtney Kardashian

Kendall Jenner and Kourtney Kardashian had some fun time together as they attended the closing ceremony of the Poosh Your Wellness virtual festival over the weekend. The sisters pranked their family members while playing truth or dare.

Kendall, 25, has been making headlines for dating professional basketball player Devin Booker but they aren't engaged yet. On Saturday, Kourtney, 42, dared Kendall to prank the Kardashian-Jenner family and inform them that she is engaged to Booker.

"Oh my God," the model reacted to the dare given by Kourtney. "But it's believable so I will do it." Before she broke the news, the "Keeping Up with the Kardashians" star borrowed someone's ring to make the entire setup look more realistic.

"This is amazing," Kourtney said. "You know Khloé is gonna write a novel." Kendall dropped a text regarding her fake engagement news in the family group and immediately she got a call from Kylie Jenner.

Kylie noted that the ring didn't fit her and said, "You're lying." Kourtney tried to help Kendall, saying, "Well, it needs to be sized." Kendall hung up to answer Kim Kardashian's call, who also didn't believe the engagement news.

It was Khloé's turn next but by that time Kendall had given up on the prank.

"That's so stupid, why would you do that to us?" Khloé asked Kourtney, to which she answered, "Well, at least we know you guys will be excited when the day comes."

Kourtney also challenged Kendall to call their mother, Kris Jenner, and inform her that she was pregnant. "That's so weird you just told me this because I dreamed about this last night," Kris told Kendall. "I think it's great news, but I'm your mom."

Kendall quickly revealed that she was joking about it.

"Mom, I'm just kidding. Mom, I'm with Kourtney," Kendall said and Kris replied, "Oh brother, I'll go put the champagne back on ice."

Kendall and Booker first sparked dating rumors in April last year and after dating for months, they made their relationship official on Valentine's Day.

"This is the happiest Kendall has ever been in a relationship," a source recently told PEOPLE last month. "She and Devin started out slowly, but have dated for about a year now."